Yes, quite a bit to look at occasion. I suspect there are many "lurkers" looking them over. Slabs with big numbers go for very large sums, and the economics of it basically influence US collectors of British material to use their services rather than worry about getting the coins across the pond for a London (or other) sale. I have gotten a few bargains by watching very carefully. I have not bid for some while but have in the past come away, like Rob, with some treasures. I have noticed that there are occasional price differences at the same TPG grade level wherein an PCGS graded coin, say in "65", will be listed earlier and go for more than an NGC identical coin also graded "65" and not visibly inferior. My suggestion: if it is a rarity with a high grade number, be prepared to leave it alone unless you want to get a bloody nose! Ouch!