I usually send in anywhere from 40 to 150 books a month for slabbing. I also press everything myself. When i get them back, about a 1/3 of them sell right away, a week later almost half of them are gone and the rest dwindle away over the course of the rest of the month, then the left overs I either auction them off, discount them or let them sit and they go here and there. I treat my ebay and run it as a business, so if someone wants to do this for a living, you can't make a bunch of cash then go blow it on beer, comics and twitch gamer girls