I am willing to pay for this service. I understand the original intent behind this website, but I regularly use your maps for my business. I am willing to bet that many of my colleagues would be willing to subscribe.
This is a good secondary option, if using our own API keys does not work.
Mike Shea commented
Add me in. Perhaps it is possible to simply charge the API call back to the user, against a set amount on account? If the API is .005 cents per call, then that plus a small surcharge to pay all other real costs is called for.
I agree with this. We also have created a number of maps for client websites and would be willing to pay a subscription to keep the service alive.