Boardwalk, I've been in a relationship with the same lady now for about 5 years, it's kind of an SD-SB relationship but it's a bit different. I help her out when I can, usually give her about $1000-1500/mo and she sees me when she can. Often I just put it straight into her bank account.
So it's a very informal arrangement. When we do see each other, which is a couple times a month, we don't have a time limit per se, it's more like I have to be here at a certain time and she has to be there. So we generally meet for a couple of hours at a time and the get togethers are very initimate. Giving her an hour long butt massage is the norm, and there's a lot of careassing etc. Over the years, I've gotten to know what she likes and I get a thrill out of performing these activities on her.
In terms of what we know about each other, it's damn near everything. We've know each others names for years. I know her daughter's name, her b-date. But over the years, we've had some very rocky moments. She even defriended me on her facebook account, and I could probably right a decent book on the whole experience.
Anyway, I was going to PM you rather than post this, but either your box is full or you don't accept PM's. Eitherway that's my experience going down the SD-SB relationship with one individual. It's a funny relationship because even though there's money involved if it's the only person each is seeing, it's very intimate on a number of levels.
I'm just beginning to realize that we're probably in a co-dependant relationship, whereby we simply want/need certain things in live and we choose to get them from each other.
As for the cost of this venture, I personally don't give it a second thought. I'm just glad to be so connected with someone so attractive and sexy that my world gets rocked everytime we meet and if helping her out with her bills is the price for that..it's something I'm glad to do. In fact, I'm probably in the minority but I actually enjoy helping her.
Btw, I don't think the key to this type of relationship is money, rather I think the key is having mutual respect for each other and mutually agreed on borders.