I had a similar situation, and went the route of open source. The product died, as no one but me really wanted to maintain it. It was effectively the same as turning my back on the project while maintaining sales, except without the $$.
I'd recommend you ignore it and focus on your new app for long periods of time. Don't fix any bugs for months on end, then take a little time to knock out the big ones. Ignore the edge cases and focus on the big picture, that this app isn't your big thing, the next app is.