“There's an old saying in Tennessee — I know it's in Texas, probably in Tennessee — that says, fool me once, shame on — shame on you. Fool me — you can't get fooled again.” GW Bush
That is why NO has to be the standard answer, you gotta be a hard sell. Otherwise sheisty d-bags sell you garbage.
Then, they get all pissy when you buck the system & try to hotknife you.