Jason,
I consider your maps to be of such high quality that I for one would be willing to pay for a packet of them. I notice you mention you don't have a lot of spare time for non-"paying" work. I'm sure the community here appreciates your work so much that if you considered devoting some time to making multiple maps I think it wouldn't be unreasonable to set up some kind of fee structure.
Just my $0.02 (and potentially much more
).