In short; I think the answer is YES - I see partially-built and started kits going out doors on eBay all the time. As Reb has said, "it depends on what you have".
Couple suggestions:
Break your collection down into bundles: If you have any "obvious" pairings or bundles - multiple kits of similar subjects, like "2 Panzer IV", or "3 hummer types" - you may get better bites and sell for more if you sell these as bundles. (I could see where a bundle of very different things would generally have less attraction - a buyer might want only 1 type of stuff so would pay less for the unwanted bits).
Avoid selling a large pile "en-masse": Your need is for some bucks and a large pile becomes a "fire sale" and will dilute the return "for sure".
Consider selling some salient parts pulled off otherwise part-kits: IF your kits include some salient bits - such as a partially-built Dragon kit with un-touched MagicTracks - the salient parts could well be worth more.
POST a list in the Buy and Sell forum this site and see whether folks express interest! It's free (I think) and so painless for you as a learning gambit. List what you have with a note on what shape the kit(s) are in. Folks will see things they might not be able to live without. I know I'm always looking for bits and stuff I can work with... Maybe you have a Dragon Panzer IV short-gun turret in your pile (I could do with one to fit a hull I have!)...
Good Luck!
Bob