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And don't forget, we can quit any time we want.

I did in fact employ this option:

SWMBO (after I had purchased my third razor): "So just how many razors do you actually need?"
Me: "I don't know, babe. I think I'd like to end up with...

Man, I feel your pain. How about this: anytime you think you're about to send SWMBO over the edge with that razor you just purchased, have it sent to me. I won't tell her, I promise!