From the sound of it, it seems this would needs to have more development before it would make anything even on Flippa.

No, you can sell even bare domains on Flippa. There are also "starter sites", growing sites with 5 figures a month in revenue and pretty much everything in between.

I know you can, but it won't get you much these days.

Edit: aka if it is a good idea, it is probably better to find someone to take it over for a gentlemen's agreement of a % later than tossing it away for a few $. IMHO of course.

Would you mind linking to the sites you've sold before, or even the Flippa auctions? I could be interested next time you have something similar, and would be happy to cut out the middleman.

This offer stands for anyone reading; send me your projects and I'll gladly take a look about buying :)