Same here. They're my favourite customers.
I've one in New Zealand I've never met; I suspected he was after a one-off to sell his property while he's living overseas, so I charged £30 for 10 minutes work.
I've done it for nearly two years now. He likes me to give him an update on how the property looks, that his tenants are keeping it tidy, and he pays me within 24 hours by bank transfer. He gave me a £30 tip on top of the £30 payment last Christmas too.
I've never met the guy; all done by e-mail and bank transfer, but he's a favourite customer.