Best thing to do is rent it or lease it.
Start low ( $150/month ) or something and do the contract on 6 months intervals, that way you can raise the ammount as his visits raise.
I have a couple of domains leased and it's the best way to go, you get a small check every month, still own the name and if they really want it, they will pretty much pay you whatever to keep it .. after they have spent so much energy and time building it.
