also...key is NOT as important as you think when buying.
Hell, I sell more off-color characters in Bronze-age at 1-3.00/book with well read covers than I do any key issue...it's odd to be honest
Kill Raven,Santana....I mean people eat that 70's stuff up and want the book to have the book. Stuff you can;t sell online,but moves well in-house
List your books, fairly sure I can tell you what will sell as long as it has a cover
Heck, I sold a Tales of suspense that was G/G+ for 25.00 last week that I couldn't get 10.00 on ebay for regardless of how important it is in the comic universe.
There are 2 different animals...ebay shoppers working on runs and people who see it, like it and grab it