Do you buy bad movies because of 1 actor/actress ?

[Wolfie65]

If I list all the actors and -esses I boycott, I'll still be typing next week, so how about the reverse.
I have several stinkers with Megan Fox - How to lose friends and alienate people, Above the Shadows, for example, as well as Christina Applegate - Vacation, Hall Pass come to mind.
For the record, the fact that those movies blow isn't the fault of those actresses...