StarFighters76, I have to admit that for the longest time, I hadn't realized (or had simply forgotten) that you were the author of the vast majority of the original maps on GameFAQs! Given that you never use in-game graphics for your work, you're probably the mapper in the best possible position to try and make money with them, though you should still be careful from a legal standpoint.
A number of months back, someone named Phillip Summers started a Kickstarter to create hand-drawn game guides for older NES games that would not feature any official graphics or artwork. The project looked really cool and the art style meshed really well with those from game manuals of the time. Unfortunately, he was contacted by an unnamed lawyer and had to cancel the campaign. The guides are thankfully still available though and for free (check out the latest updates on the Kickstarter page for the links) but it sucks that the creator can't make money for his hard and impressive work (although you can pay what-you-want for a kind of making-of art book for the series). But hey, if you ever manage to make it work financially, make sure to tell us so that we can celebrate!
I think for me, this is my ideal way of making money:
1. A site willing to pay for each map I have to be hosted on their site. I did this in 08 with a site called ChapterCheats, and while I did get a few hundred dollars out of it, they realized that their gimmick didn't work so well when it came to me, so we parted way, even though someone is using my name on their site and there is no way to contact the owner to get that fixed.
2. Ad revenue would also be nice. GameFAQs years ago was working on the idea of ad revenue, where they would place on ads on every walkthrough/map and we would get paid through that. Unfortunately CBSI (at the time) decided after years of debating, they just didn't want to bother with it. Now that GameFAQs is owned by Red Ventures, maybe it could happen, but I highly doubt it.
3. Donations. Since I started using Twitter, I decided to put a donation link in my profile to my PayPal account, to get donations. So far that's gotten me about $55. I figure I should do this as another way to get paid, seeing as for some unknown reason GameFAQs decided to remove the donation link from all maps (regardless of the creator), but kept the donation link for written guides.
So any combination of those would be pretty ideal for me. Sure it wouldn't amount to much, but it's something.
Also a friend (who is an game developer himself) gave me an idea about mapping out indie games, which I mean, I suppose I could look into it, but I'd have to think long and hard about that.
But yeah, 20 years and 3,600 maps, I think it's time I start getting a little bit more out of it than what I have been lol.