I have had pretty good luck selling and buying on ebay. You take your chances, on things I don't want to give away I always put a reserve. Some items went for a lot less than similar items just a few days ago and some went for a lot more than I expected.
I always seem to loose a little on shipping. On large items I usually sell with buyer to pay actual shipping costs. But I forget about the time and packing material I always end up using. I have yet to have anyone complain or leave neg. feed back.
I usually sell only to North America but I did have a fellow downunder bid a very good price on a antique R/C car and since he paid all the fees I went ahead and sold it to him.
I very seldom "bid" on an item, and if I do I put in my max. bid up front. If I get OK, if not OK. I prefer to "buy it now". I also refuse to buy items that have a ridiculous S&H fee.
I prefer to use Paypal, other than that I only accept a USPS money order.
Just be careful and ask the seller for more info and pictures of the actual item, if he balks, then don't uy from him.
Good Luck,
Julian