2 things:
1) I think you've looked at too small a sample. When I met Mr. Jespah, I had literally dated over 100 guys through the Personals. It takes time. You go through a lot of bad dates. But I think that's a sidelight to being picky - the best possible person doesn't just fall into your lap. But there's an upside to bad dates - you learn what completely turns you off. You learn how to better screen through the phone (or email). You learn how to make conversation even when the other person is a bump on a log. It helps for when you begin to meet people who are more your speed.
2) I think a trip to Google is in order, to look for "intellectual singles" or "over-50 singles" etc. and try to get to a service that has already narrowed things down in this area, rather than
www.match.com, which sounds like it's a more general service. When I met Mr. J, I had started with Newsday (this is before 'net personals) and I found the crowd was mainly not too intellectual. It wasn't until I started scanning through The Village Voice that I started to find men who were smarter and more to my liking. But even then, I went through at least 20 - 30 dates from Voice ads before I found Mr. J.
Keep plugging. Good men are out there, I'm certain of that.