You can become a charter member very cheaply then sell here direct. Here's what I do. I stacked some silver I had got from CRH. Those went to the "better" coin dealer in the area, and full rolls of silvers went on you know what bay. I did ok since I had found them, but take in the cost of gas, etc. It tends to even out. My slabbed coins went on ebay. Still have some but most I had graded myself through one of the big firms, and so was able to sell something people wouldn't hassle me over. The rest got dumped at a coin dealer.
With Ebay and paypal, you can figure in their fees, so it will cost to sell there. It does work, buyers these days can be less than scrupulous, so you have to ship with a tracking number and expect some amount of flak from time to time, and unless its coins in a roll of like coins or slabbed, expect some hassle.
The proof and mint sets are so plentiful you can sell them, but they are not extremely popular right now. You can sell rolls of silvers on the net easily, and get a decent price for them. Even rolls of newer coins, uncirculated, sell ok on the net. People are looking for errors. Individual good coins I generally keep. But these are the few and far between $100 and up each type. Most everything else, I'd dump at the most reputable dealer around. Selling on the net takes a lot of time, energy and comes with the commission prices.
A truly rare coin, go with one of the big auction houses. I dumped a few very old shipwreck coins today and some foreign coins. Went to the local dealer I know and did ok. Not great, but ok. If you purchased the mint sets, you will probably lose on them. Same thing will bills, unless they are mint. I'd put them on the net. Hope this helped some.
What I do is look on the net to see what one just like mine sold for, then judge from there. I have been downsizing purchased items for years, so fortunately, have a very small collection right now.
