repeated raises

[PorscheNGuns]

Ok the basic question is, at what point do you not call a preflop raise, even if the pot odds are correct?

The situation is, blinds are .5/1, assume you have a mediocre hand, (Pot Limit Omaha or NLHE) you are the BB and everyone calls around to you except for the SB who min raises. You call, and then everyone calls around, but then the CO min raises. Everyone calls again, including you, but then SB min raises, etc etc on and on and so every time you call a raise someone else min raises.

At what point do you say enough is enough and fold to the minraise? (assumptions being that you wont raise yourself, and that you know that no one else will raise beyond the minimum raise and also you know its not a scam to continue to minraise until you fold, also assume everyone has seemingly endless stacks in front of them)

??

-Matt