As a man, my online dating experience is undoubtedly different than yours, but I get my share of scams too. Hot young women half my age who live in the Philippines apparently find me irresistible. I think the first filter you should apply is location. I don’t take any contact seriously if she’s not within 50 miles of me, and even that is stretching it. I dated a woman who lived about 50 miles away for a few months, and it was a real challenge just getting together. Unless you’re in some very special situation, I don’t see why you would even be considering someone who lives hours away. How could such a relationship work? (I know there are long distance relationships that do work, but I honestly can’t see how, and I’m sure it wouldn’t work for me.) I do try to respond to most messages, even if I’m totally uninterested, because I know how depressing it can be to send out a thoughtful, carefully written message and get no response. But I don’t bother for the obvious scams, or the ones whose entire message is “hi there”.
In my experience the normal sequence is, you exchange a couple of messages on the dating site, then have a phone call, then meet for lunch, and if all that goes well, congratulations, you’re dating. You don’t even need to give out your phone number for step 2 – tell him you’ll call him, and block your CallerID when you call him. Only when you’re ready to meet in person should you give out your phone number or email address.