See, it's difficult to figure out the best way to handle something like this. ;)
If we made YOU submit the app yourself, I'd imagine that would be a headache for most admins. I believe Apple, for example, has some sort of fee to be able to submit apps, some sort of application process, etc. Then if there was a bug, we'd have to distribute the updated app to all our customers who would then in turn have to submit their app to the app store. Could get to be a good wait to get updates out there.
On the other hand, it's not quite as "clear" to a user the purpose of downloading a generic "IPB Interface Tool" from the app store, and then manually put in the url to your board. Most general users don't know you run IPB, etc. etc. so it wouldn't make as much sense as downloading a "MyCoolWebsite app" specific to your site.