If you bid more IGB or TBT than you have, you are not really being competitive, you are just lying and making it harder for the seller and other bidders. I usually set a limit for my bids. A lot of people have cycling towns or have villagers moving out for other reasons, so I'll probably be able to find the same dreamie the next day at worst. I don't like to overpay a ton just to get my dreamie 1 day sooner.