Do you think that this is related to their takeover/merger with Espotting? Espotting currently have a minimum bid of 10p (15 cents), which is much higher. If the two companies are to merge, their services will need to match as well, I would think.
This minimum bid raising trend seems to be a normal development as a PPC matures, irrespective of their merger. FindWhat seems to be asserting themselves as the biggest of the Tier II PPCs. I know that their traffic requirements for affiliates are higher than all of the other Tier II players, and not too far off Overture's minimum requirements.