re how much is your collection worth?

I have always found it a better strategy to list items like this individually rather than as a bulk collection

The reasons are:
1) a bulk collection is much more valuable (= expensive) and you eliminate a large % of potential buyers who do not have deep pockets
2) most collectors already have a good start on their collection and may need only a few issues here or there but it would be waste of $$$ to pay top dollar for something you already have most issues.
3) the shipping costs get extraordinarily high when you have bulk items to ship
4) a "newbie" who wants to start collecting something will most likely just want to start gradually with a few issues here or there. Rarely does someone join a hobby and instantly want to purchase a complete collection.

My 16 year experience on ebay as both a buyer and seller is the best strategy is to have the most potential buyers for any particular item. Listing items individually rather than bulk will get you more buyers, and for the most part higher (combined) prices - the drawback is you have to ship individually as well.