Multiple bids in advance is not a sensible policy. By doing so, you may cause yourself to pay nearer your maximum bid rather than something lower. For example, if there was an item starting at £15 and I enter 5 bids, those bids have to adhere to eBay bid increments - therefore those bids have to be at the very least 15, 16, 17, 18, 19. So an uncharitable fellow might see those bids and bid £18.99 knowing for certain that I'll still be the highest bidder and be £3.99 worse off into the bargain.