Thanks for the kind words! Glad you're getting your money's worth and that you're keeping me in mind. :)
To me, these sets are a great way to advertise my work and while I played around with different pricing, I always went back to the 5 USD base price. Just seems right.
I'm currently working on some commissions and I have some loose plans for more icon packs (mostly crafting related, but I'd love to do a cyberpunk-ish one). I also dabble in tilesets, but that's going to be a while, I'm not as good as I'd like to be.