Posted By:
RobTo make your item seem reasonable. But I can think of ways to neutralize that from happening. If an item is common enough for a competitor to run up the price, then simply end an auction to sell at the current bid, or use a BIN, or use a store and list at slightly (not grossly) above market price ,to account for the higher commission fees. As for FB, never leave a negative till after you get your fees refunded, so you don't get retaliatory FB.
But we are talking about a common T206 PSA 3 type item here. Frankly, I don't know why people even bother with auctions with such items, the market prices are narrow enough to just simply list something with a BIN at the upper end of the price range.