I think though that you have to remember Freecycle is mainly there for those who want to get rid of unwanted stuff instead of having to take it to the tip.
If you are giving something away,does it really matter what happens to it afterwards? People often lie anyway and do re-sell, it's just a fact of life that people want something for nothing and to make a profit. If you are that bothered about re-sellers, give it to charity or sell it yourself.
There is no excuse for rudeness but people who are collecting your unwanted items are doing you a favour too, saving you time and effort etc. So, if responses to your ads are rather brusque, at least they are willing to take your items away, no matter how rude they appear! E-mailing/ written communication can often be misinterpreted anyway.
I hate Freecycle overall, even though it's a great idea. Things are ALWAYS taken when I reply, even when I respond straight away and there are always more wanted adverts. Those offering goods often never get back to me and it's too much hassle, so I've unsubscribed. I know many have good experiences but I'm fed up with explaining why I want the item and saying 'yes, we can collect today, many thanks' and the bloody person won't even bother to reply.
I think there should be a web board or something like that, rather than getting 50 inbox messages every hour! Our Freecycle is quite poorly run, all sorts of silly stuff gets put up there; even a post about Michael Jackson's death a couple of days ago!