I'm with you there 100%, DM.
Ever done any gold panning? Many books on the occult are somewhat like gold panning, seems to me: you have to shovel, sort, wash, sort and wash again and discard several loads of gravel before you find any nuggets - but with a bit of luck and lots of work, the nuggets are there.
If I find occult books anywhere, flea markets, yard sales etc I don't even open them, I just buy them. If you find a book for a dollar or less that even touches on a subject you are interested in buy it. You never know when even someone's scribbled note in the margin will open your mind to something. Besides, you can never have too many books.
A perfect example, one of my top 3 occult books and one which I insist any student I work with read is Marion Weinstein's Positive Magic. I paid 25 cents for my copy at the flea market. It was in a box with a bunch of other books and I bought them all for $3.00. Ended up with 12 books and the Positive Magic alone was worth every penny and then some.
the point is, I didn't buy many of them because they appealed to me, they were just books on the occult. Some I've read avidly, some I've skimmed and some still sit on my shelf. They cost me little and have given me so much more. Any book is still a book and books will always be a good thing.