Ebay is virtually dead these days. Nobody is willing to pay good money for good coins. On a personal level, I will only spend money on something decent if I know the coin, or is a particular seller I can trust. I put things on that are dirt cheap with a smattering of higher grade things, but the latter rarely sell. A couple of quid here or there is less of a problem, but don't expect bargains.
From a sellers perspective, a few quid for something worth a few pence is a good margin, which is why I persist. If you bought the same from a dealer, you would still have postage costs, so nothing lost.
TIP. Don't assume dealers are trying to rip you off and charging over the odds - that's ebay area of expertise. Do a lot of spadework and you will see that many are quite reasonably priced, and despite the apparent attraction of ebay's buyer/seller protection, like any insurance, the proof of the pudding is when you try to invoke the protection. It might work. Though to be fair, ebay's policy of buyer good, seller bad, means relatively little hassle for buyers. Any respectable dealer will offer to take returns in a reasonable time frame, allowing for people going on holiday, but to say you don't want something 6 months down the line because you just found better is likely to be viewed as tough shit. Responsibility/respectability is a two way thing. At the end of the day, most people on this planet are decent and honest, so don't lose much sleep over it..