I think this is a great posting. I myself have thought many times what I can do to improve my profile, or anything else to help meet someone. I hope this being a catholic site that people would respond to your question with respect. I personally think the idea is great. Best of luck.
I would say that no one will ever tell you anything helpful. It's like applying for a job, you don't get it, and you ask "what could I have done differently" and they never tell you, they say "the other applicant had more relevant experience" or some other lame reason like that.
No one will ever tell you the truth; it puts them too on the spot, and whatever it is, it will be nothing they would every say out loud ("you are not cute enough"; "I want someone within 1.2 miles of my living room sofa;" etc.).
If someone says no thanks, say good luck to you, and move on.