Well it certainly is alot of fun digging threw them to see what gems might be in there. It sounds like you should go ahead and get them, there might even be a few feature matches and who knows that rare NV one might be in there?!?!?!
I got serious about collecting casino matchbooks 5 or 6 years after I had started the chips n stuff, thanks to gallon baggies full of books at an estate sale I wandered into, noticed a few old Tropicana and Flamingo books and I bought 'em all and now 7 years after that.................I have thousands of NV casino covers and I'm damn glad that I do!!!