You're welcome to list your app on our platform at whatever price you feel is appropriate. Having said that, we strongly recommend that you seek a valuation from us if you feel like you might be a little fuzzy on the details. There's no one in the world that understands app acquisitions better than us, so you should definitely use our valuations as a resource.
Keep in mind, valuations aren't designed to tell you exactly what you're app is worth on any given day - they're designed to give you a number that we feel will bring a buyer to the table. The final price (the app's true valuation) will be decided between you and them.
Likewise, there are some extreme cases where we might reach out to put a listing on hold, due to an obscene asking price. This happens very rarely and is on a case-by-case basis.