I must be missing something because I don't understand why they are so desperate to get rid of it. If it's really making $200,000+ per year just hire someone for 1/4 to 1/3 that to handle it.
Hiring and managing a person is not a zero-cost effort, even after you account for direct compensation costs. If you value giving employees great jobs, and a chance to do excellent work, then hiring someone on a different continent and not letting them contact you is not aligned with your values. Further, management bandwidth is one of the most expensive resources at any company, and spending it on a non-core product is not smart.
Focus matters. It's one reason why most successful businesses aren't do-everything conglomerates.
After the handover (which would be needed for a sale as well) there is no need to ever talk again. Just put the guy on auto-pay and have the contract automatically terminate when the revenue falls below a defined threshold (i.e. the site has fizzled out) or when the SLA is not met. Not rocket science really, should take all of 15 minutes to write a shell-script to send out the notification when it happens.
Of course if you pick the wrong person you might have to do it again, but I'd hope 37s would be able to gauge the competency of a candidate for that role. It doesn't take a genius to keep a trivial rails-site running, and motivation shouldn't be an issue with that kind of compensation.
But sure, if throwing away $100k/year in passive income better "aligns with your values" then you have bigger problems anyway...
Yeah, or let someone in-house make it their pet project. Tied with the 37s name/links etc and that revenue, what a great side project for someone to run...