Glad to see I'm not the only one!
Partially agree with Sandi that you shouldn't expect a reply - but if you've joined up to a site like this that is about connecting people, then I think it's common courtesy to at least pop something back.
However, I can see that by replying you are opening up the possibility of an ongoing conversation, which some may not want to do. Also, replying with a 'thanks, but no thanks' may also seem rude and be hard to write back like that if you lack the confidence to be straight up with someone.
Maybe, in addition to the 'reply' button, there should be a default button that sends a standard message that indicates the user doesn't want to engage - would make it easier.
But, for heaven's sake, if you've been sent a polite, friendly PM, it's not that much hassle to get back to somebody
As blokes, the first contact is unlikely to be overly forward, want to be reassured that there's some form of connection and ability to talk to each other before being too obvious. Help us out, please!
On another note, just wondering if people react differerently to status - I've changed mine to 'Single' whereas it was previously the more accurate 'widow / widower' - do women react negatively to this - maybe that's why hardly anyone's replied (or maybe just because I'm an ugly bugger, that's easier to understand!)