it depends on the scenario.. no u don't just ship allin unless its final table and your in a bluffing position. But if someone else is allin in front of you the only proper time to fold is when your playing an event that credits top 15 or top 30 or top 10 with a token/coupon or all the same prize pool.. at that point if your near the money it could be beneficial to fold and just let the other players bust each other