Personally, Ive had a few guys id consider having long term arrangement, and one guy, I did get into the conversation but he did mentioned he does not prefer to be tied. Not directly to me nor to my request, but i cant recall exactly how, but he told someone (customer) asked him to be "boyfriend" but he sort of dismissing the idea because he doesnt want commitment. I did asked about if he had one before, and he told me yes, long time ago (before he met me), with a local guy, and he did receive monthly stipend, for about a year.
There is another guy who told me he used to get a sponsor before too, when i asked about him missing from the scene. And other times when this came out, is when one of the their Bar friend went missing, I would ask about them, and sometimes, their answer is he got a sponsor.
These are all a good conversation starters to bring up the topic and not directly discuss the arrangement if and when you are ready to talk with Cam about the topic. This way you can sense whether he likes the idea or not, without directly offering him hope.
Or you can also wait it up until the guy themselves brings it up.