Minimum charges suck. I will no longer yield to their demands. If you can't sell me an overpriced Gatorade for $2.19 on a sweltering spring day because "minimum debit, credit charge is $3.00," but then you allow me to add a can of Diet Coke to the deal, bringing the total to $2.99 ("That's okay"), then you don't need my business anymore.
Same goes for anything else. If you make me buy/pay more for anything because of some pre-established minimums (minima), I just won't buy/pay for it at all. I'm sure you'll have luck suckering other suckers into buying useless crap they don't need so that both you and they can have the ultra convenience of not having to carry around cash.
Enjoy your spaghetti -- you're very egotistical.