"Significant" is relative. I don't have many, and 
a good fourth or third of them is quite expensive.

1. Tasuki & Tama - $480 (discounted)
2. Tasuki & Chichiri - $270 (auction)
3. Lina - $256
4. Slayers Group - $525
5. Valgarv - $413

And quite some over $100.

And considering I never really held such amounts 
in my hands, well...

As for selling probs, well, I haven't tried 
selling them, as I only spend that much on cels 
if and because I like them as much as to spend a 
car's price.