Don't know about wealthy, but having had bf's in varying age ranges (e.g., bf in his early 20s and current bf in his 50s), I've found current bf to be more interested in what I want, whereas other bf was just more interested in getting off as quickly as possible.
Perhaps it's something along the lines of wealthier men are more likely to be older and more educated, and a certain amount of education about female desires helps them to be more considerate and not just focus on their own orgasm but also that of their partner's.
Plus status is also an attractant and maybe adds to the mix. Hell, if a woman's appearance can be a turn on for a male, a guy's status can be a turn on for a female.
I doubt it's age so much as personality. I've stayed in the same range (early-to-mid twenties) with every guy I've been with thus far, and have had guys range from incredably selfish to actually seeming to
prefer giving to receiving (well, in the bedroom, anyway). I've also learned though experience that having the basic attitude that "if I'm not into it, I'm not doing it" is vital, no matter how eager-to-please your partner is. As far as prior experience, some is certainly better than none, but after awhile, experience seems to stop making a whole hell of a lot of difference.
In terms of this study, the more I think about the sampling the more suspicious I get, frankly. Also about the reporting. Personally, I'm not afraid to say "Umm, actually, no, I just got
close. Good try." All-about-honesty though I be, I wonder how I'd feel about saying that to a man who had inducted me into a not only secure but lavish lifestyle by virtue of marrying me? Then again, I'm not too fond of the idea of marriage, so 'for money' is about the only way I can picture myself getting suckered into it anyway.