HEADS UP ON PAYPAL FEES CHARGING WRONG

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Now why would anybody get their panties in a wad over being screwed by a seller on fees.
Are you the one that got his panties all wet about vendors requesting the Pay Pal fee, in their ads?
What's wrong with being up front in the ad, stating the preference in how one does business in selling items?
Could have easily given the fee at the end of the sale, in giving the buyer the total amount.
What's the difference?