Hobby Hubby? I'd have to think that anything close to a marital arrangement wouldn't involve having sex. Isn't that why we're here?
I've been what I'd call a Hobby Big Brother. In Ohio I had 3 ladies that I had seen as Providers that became "Wards of Loxly" for lack of a better term. I no longer had sex with any of them but would have them over, singley and together, for dinner, haul them to "Special Events" (M&Gs), provided emergency roadside service and actually had to bail one out. There were a few other services that I did as well.
They'd also let me know where they were going if they happened to have a bad gut feeling about their date.
Some might call this being a borderline pimp. Whatever. I look at it as just a friendship that developed. I'd have to say that between the three of them they did help me out with hobbying and steering clear of some of the more "questionable" providers.
I wasn't alone in this either. We had a tight group back then and collectively served as a "Functional Hobby Family" with pooled services along with coming up with special events.
Establishing any sort of relationship isn't for everyone. As some have inferred "familiarity breeds contempt" so finding a balance, understanding it, and maintaining it with someone is tricky.
I think the ladies would be better off seeking out a non-paid male escort for events from guys they trust. Especially if they have the intention of being the designated drunk at a party.