Its not like these are one of a kind items, well most. If someone bids against me, ill try again, if I dont want to bid against someone, so be it, it will come up again. Your guide should not be who you are bidding against, but the closed auction list and your lust for the item. Thats what i go by anyway. If someone on ATP has a bid in for 2 bucks on a 40$ plant, darn sure Im going to bid against them. If they are close to the value I have put on the item, then on to the next time.
There are too many people, from to many places, that the few people from ATP are certainly not going to set any prices on the LA I dont think.