This defeats the very purpose because multimillionaires are generally wary of gold diggers and you'll only scare them away.
All these web sites have a power search or advanced search features wherein you can locate people who have a certain minimum income. is a community dating web site meant especially for gays.
At any given time they have over 15,000 people online.
The fact that they're limited to the US is a big plus for their members.
If you're looking for a serious stable relationship with a wealthy person who shares your sexual preferences, go for general dating web sites.
This holds true, irrespective of sexual preferences or even gender.