Everyone thinks that their email deserves a reply.
I, for one, will never buy into the notion that I owe *anyone* a response, no matter how well written they happen to think their email is. I may decide to write back, but that's completely at my discretion and I won't be guilted into doing something simply because it's what someone *else* thinks is appropriate.
There are lots of reasons why people may not respond (and there was a thread about this some time ago. who's the genius at looking up old threads?). If you take a look at my profile it says, basically, not looking, not interested, leave me the hell alone (that's a summary, not a quote). And I STILL get emails from people wanting to meet/play/be my one and only. Can you imagine the number of emails women who are actively looking and say so receive every day? It's staggering. We could spend all our time answering email and still never get through it all some days.
Someone on another list I participate in made himself a female profile, just to see what we were all talking about. He pretty quickly changed his tune about the "need" to respond to email when he realized the sheer volume of it all.
Next time you (generic you) write to someone and then get pissy cuz you don't get an answer, remember that you initiated it, at your own behest not his/hers. The person in question doesn't owe you a response any more than I owe a response to every solicitation letter I get from a charity organization. If I decide it's something I want to contribute to, that's my perogative, but I'm certainly not obligated to send them a "thanks but no thanks" note.
Making decisions about how to best manage my time/energy isn't rude or lacking in common courtesy. It's called being a responsible adult.
Fighting for peace is like fucking for virginity.