This is something I hadn't fully considered. One of the biggest expenses in running a wedding-related business is advertising. Unlike other purchases, wedding-related stuff is only purchased once in a lifetime (well, twice or thrice these days in America, but you get the idea).
Thus, brides and grooms rely on the opinions and advice of friends - word-of-mouth promotion is key. But ultimately, heavy advertising is the only way to reliably get information about your product out to the general public. And the App Store is a great form of free advertising (well, not counting the cut Apple takes), especially if you make it into one of the "Top" lists.
Not split testing the sale price though, it will be free. (It's just too hard to get people to buy an app outright) I want to split test in-app purchases. I think this should be fairly straightforward to implement. The only downside is in the app store 2 different items would show as top in-app purchases with different prices. People might be upset about that, but I doubt anyone would notice.
(Note: I had "pro" as much as the next version, but seems better than a multi-hundred dollar DJ)
On the other hand, after 1.5 years at $5 we've been trying $2, and revenue has been consistently higher since the change. I suspect this is because it drove us into findable range in the "Top Paid Music" chart, but with no analytics it's frustratingly hard to prove.