The same set of issues arise when you look at the libraries the tools use to do their work - Not all are necessarily free and open source and maintained by really charitable people. And free or cheap webhosting among friends often comes with rules or expectations regarding being noncommercial.

When you cross borders, issues can get worse - In Germany, for instance, lawful crowdfunding and micropayments put such a burden on the beneficiary regarding taxes, receipts and documentation that it's usually not worth the effort at all, so doing it wrong in terms of taxes (and social insurance and health insurance, at great personal risk) or shunning commercial uses altogether are often seen as more viable options. 

In Germany, going commercial also means adding an "impressum" to your website and revealing your identity.
And it makes you eligible for being sued for patent and trademark infringement, even if you invented it all on your own and had no idea and only generate a tiny sum of money with it. These implications are a little worse for programs than for maps. Suddenly you can need legal counsel that puts your whole finances at stake.

All these issues are veiled very easily if you just look at the simple need for earning a reward for your time and crowdsourcing platforms offer great tools to do that easily... while covering their own asses on the legal side very well.

OK, hope that was my last post part now.
And again, this is no statement about the quality of your work. 

What about patreon? this sound like you need more support for other projects also. Patreon is way to go really. 

At least check out website, there is a lot of creative people. The most important thing is to get founders, and be loyal to them. In patreon you can list out many other things that might come to you mind, not just singleplayer maps, but also list out other things - so people will understand the bigger vision you have in mind.

https://www.patreon.com/