Even after reading this and now knowing that you can make and buy free maps with a free account, it's still really not clear from your website that is the case.

My recommendation: make it as stupidly easily possible to buy a single map whenever you want, with the option for no account at all (and make it clear you can do that through your website).

I could conceivably see myself using this, the output looks really nice. But as soon as I need to sign up for an account, even if it's free..... ugh :-/

Make it easy for people like me who might be on the fence to give you my money :)