Great book, Jeff - compared to the elusive Jumbo 31, how tough are the surrounding issues?
I don't know that there are more copies of 30 and 32 out there than there are of 31. Folks just don't seem to be as ardent in collecting them. I've only seen 2 copies of 30 and one copy of 32 available. The other issues in that range just seemed to have popped up at one point or another and the competition isn't usually very fierce. They may be very rare, too, I just happened to find the one available copy without having to search.
I guess the truth is, the only issues that have been difficult to find are the ones that are promoted as rare so everyone squirrels away their copy. I've certainly heard about more copies of 31 being around than a lot of other issues, it's just that no one really cares about anything but 31.
The SA census is sufficiently built out to correct conventional wisdom of the scarcity of a number of different SA issues. Some issues are more scarce than expected and others, less. We have learned a little bit about scarcity of GA but not as much as SA because I think the census is still far less complete due to intransigent collectors too stubborn to slab.
Thank goodness you're not like that - oh - wait -