Alot of those are probably a dime a dozen. It really has to fall into a few categories to be worth much..
a) UK Pressings of early British Stuff on oddity labels can be collectible.
b) Promos and Demos
c) Colored Vinyl, if it's limited pressings
d) Mispressings - Sometimes batches of records would be released with tracks that were in wrong sequence. Those are pretty collectible.
I'm assuming most of yours could be had for a few bucks apiece, if it's in good shape. Also, remember if you're looking up albums on Ebay, don't get overtly excited for two reasons.
Ebay market fluctuates, and most won't sell for the same price. Also, if you see one of your listed for a high price, don't forget the album you have maybe a later pressing, on a different label, or many other various factors.