Buyin old lady comics

Ok so this is a touchy subject, has to do with buyin really expensive comics for $1.....lets say theres a flea market and a 70 year old lady is selling a dead mint copy of avengers #4 1st cap amer. But the thing is she wants $5 is it wrong to purchase the book? Should i give her $50 to be nice? Or have the collecting gods shined there light on you? For all who read this plz respond or follow me so i can get some input , im really interested in this subject.

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