Ryan Dave Jimenez

One possibility for him not replying is that he's changed his e-mail address, 7 years ago he may have been still in school and had what he thought then was a 'cool' e-mail address but when he left school and entered the big world of work he realised that his 'cool' address didn't look quite as cool  on a job application or CV so he got himself a new one. A couple of my younger friends have done this. 

Another possibility is that he either doesn't check his bank statements very carefully or he doesn't have time to visit your site any more and thinks it is still running and is happy to continue to contribute to it.

How you stop the payments is quite a problem because if he's set up a regular payment to you with his bank only he can stop the payments.

Yeah that's true. He definitely moved on.

I emailed him a few times so my conscience is clean.

It's only $1 monthly so he probably shrugs it off as some fee for something.