On Monday we released some interesting numbers on the state of the Windows Phone App Hub at launch. If you have not, you should read the post. It includes some in-depth information on the overall number of apps and their prices. At the time of its posting, the most expensive app was a $29.99 app known as Bencao: Chinese Herbal Medicine. From the description, it is an app that provides in-depth information on herbs and remedies for those interested in traditional Chinese medicine. Yesterday, I commented that SlingMedia’s app, one that sends your own cable TV signal to your phone, known as SlingPlayer, became the second app to be sold for $29.99. Put together, these two apps were the two most expensive apps for Windows Phone 7, until today.

Released on November 9th with a price tag of $499.99, enter DateSquare for Elite. This app leaps past the two aforementioned apps, taking the title as the most expensive Windows Phone 7 app. Reading the app description it seems like DateSquare for Ellite wants to allow celebrities, multi-millionaires, lawyers, and other single “elite users,” a way to find each other and date. The app seems to do this via a mix of on-phone messaging and push notifications combined with Foursquare check-ins. In essence the app provides you a way to find potential dates by either messaging them or seeing their most recent Foursquare check-ins. In addition to using the Foursquare API to see potential matches as they check-in, the app allows elite users to search for each other and chat before (or after) meeting up. Below is the app’s description:

“DateSquare elite-app shows elite girls and guys (celebrities, multi-millionaires, lawyers, doctors, executives, engineers and other elite users) available for date and checked in to your location or a nearby place. As an Elite Member, you will be in complete control of your membership as you could view any profile but only elite users can access your profile. It shows you matches – (when criteria for both you and your potential date matches based on your profile & preferences set in the app) in a separate view so that you don’t waste time hitting on someone who might not be interested in you.

This elite app lets you:

1. Ask for a date by sending an instant message with your profile displayed on your partner’s mobile

2. Get instant response to your date request

3. Instant chat with someone you might be interested

4. Look for potential dates located anywhere in the world by using our innovative Map search. The map plots pictures of people on the location they are checked in at real time.

5. Dial your date directly once he/she confirms your date and call request. No more asking of phone number required.

6. Get directions to your date, once he/she has accepted your date request.

7. Check in to venues powered by Foursquare. All your check-ins from DateSquare app will be counted for badges/mayor-ships by Foursquare. So you don’t need to access two apps for check -ns.

8. Get notified instantly when there is an elite match available nearby your current location. This way you don’t have to keep checking your app for possible dates. Simply check in to a venue and we will let you know as soon as your match is nearby.”

In addition to DateSquare for Elite, the developer, TechVoyage, provides a free version of the same app, known as DateSquare. Released to App Hub before the Elite version, on October 30th, the free app purports to provide the same location-based dating meet-up and messaging service. From its App Hub listing, the description of the free version, also located on a website dedicated to DateSquare, is similar. In addition to the details mentioned in the Elite version, it mentions that your Foursquare credentials are used as the basis for registration within the app. From the video above it looks like you can set your physical characteristics from within the app as Foursquare does not provide a way for its users to list their physical attributes. There is no mention of any degradation of functionality between the two apps. Like the paid version, you can message a potential date before meeting up or see other matches near your location. Other than allowing only DateSquare Elite members to connect with other Elite members, it is unclear how the two apps differ.

From an App Hub point of view, the $499.99 app raises the average price of all apps to $1.46. This is up from $1.19 average set this past Monday when Windows Phone 7 launched in North America. On one hand finding potential dates via Foursquare never sounded easier, on another it never sounded more expensive. If you are not looking for a certain Foursquare badge, or have enough disposable income to consider yourself “elite,” check out DateSquare or DateSquare for Elite in the Windows Phone 7 App Hub. Hopefully this app (a web app is available to iPhone and Android users) finds its way onto the phones of all the lonely Foursquare singles out there.