I have around 600 books in my wishlists across Logos and Faithlife ebooks.
This includes 108 books I already own in Kindle or Olive Tree, 47 books I own in print and 122 commentaries that I don't really need given the size of my existing library of commentaries. Plus other books of possible interest.
However, I also categorize my wishlists depending on what I'm prepared to pay. I now have ZERO books that I'm prepared to buy for anything less than 50% off. The only book I'm really keen to buy out of the 600 books is Moo's new ZECNT on Hebrews, but I'm not willing to pay more than $20. My wishlist therefore is really only 1 book maximum, with the other 600 or so there to help me monitor sales. In reality I'm not prepared to pay more than $10 for any of these books in my wishlist.
Therefore, my focus now is exclusively the monthly free book of the month offers, truly significant discounts on sales, and prepubs with enticing discounts.