If they're cheap, do it! The quality will be variable, as in all serialised publications where the editor has to fill a page count on a deadline, but you'll be used to that from reading comics
I've read a ton of golden-age SF in reprint anthologies, but you often find the same few "best" stories are used over and over again -- editors probably pulling from earlier anthologies, rather than going back to the source to see what's slipped through the cracks. When you consider how many pulps were each printing half-a-dozen stories every month for decades, there must be thousands of stories and dozens of authors that never get reprinted, and just because an anthology editor didn't like them doesn't mean that you won't.
I could probably spend the rest of my life reading nothing but fiction published before my birth, and still never read all of it. There's no more need for anyone to write anything new, really