I ran the app for free for its first week in the store to build up positive reviews and downloads. This past weekend, it automatically rolled over to costing $2.99, at which point I expected downloads to stop cold.
I checked the stats today, and while they did slow down quite a bit, I also made my first sale! I am far from actual profit, but it feels great to have actually made revenue! Hopefully the first step towards the real product-selling dream of decoupling my income from clocked hours in front of a screen.