had that happen to me too, the swap where they don't get back to you. But i understand if people get busy, that's fine, just would be nice for a heads up.
Yeah after 20 some people dont respond i really thought i was a horrible writer... and gave up for a while, but then the people who did respond to at least half, said they loved it and such... so then i thought they had to be lying right? So i rewrote the book AGAIN! (around the 6th time that point). Then sent it out more, and still got people who didn't reply... then i got really depressed... and thought it had to be because of my problem with grammar, so i tired (for the millionth time) to find a way to fix that. Then Finally the editor buddy came along, and her comments have been incredible, and she seems to be really liking it, and my mom (not that that really means anything) really loved it, and my Ex really loved it. So I really dont know anymore who is telling the truth and who is lying or if i just have really bad luck with beta's or if I'm just really a horrible writer.
But i guess everyone feels this way? Who knows.