I'm not a collector - I'm actually trying to offload a collection I inherited after a death in the family.
Nothing super collectible, mostly modern age books. I've already sold most of them on eBay without bothering to have them graded. Did reasonably well, although I probably left a chunk of money on the table.
I recently found a few silver age books that are in NM to MINT condition, including one that's signed by the artist. So, I joined CGC to submit those and a few other random books for grading.
Then I'll decide whether to sell them on eBay or see if an auction house is willing to take them on consignment.