I'd probably find it more disappointing sending a message to who I think is a good match, not to get a reply, to then send one to someone I didn't find attractive only to then get a response from them.
Out of everything in life you can skimp on and make excuses for, a potential life long partner shouldn't be one of them.
Just my 50 pence.
In my experience the internet is such that girls don't give much away... you can have one with a detailed and interesting profile who means nothing to you, and a girl with a short and sweet profile who is really interesting. Like he said, you need to get the messages out.