While I agree with you, I think its important to keep in mind two things:

1. Your post count isn't very high, and I faced the same thing as you when new to FT as well. You'll find that once you've contributed more and people see that you're not just a freeloader, that you're more likely to get responses. I realize its frustrating, and post count isn't everything, but it does show that you stick around a contribute rather than just asking for things.

2. Some posters may be bombarded with PMs, like I have been after certain posts, and while it may be good manners, it doesn't make much sense to respond to 20 different people with a bunch of different questions to say, "Thanks, but I don't have time to give you a detailed response, etc."

Just my few cents. Stick around, and continue to contribute. You may find that there comes a day when you don't have the time/energy/desire to respond to every PM you get as well.