But even then, you're clearly not 100% motivated to "pay for performance". To some degree you are, clearly - but a large part of why you tip is cultural expecta

But even then, you're clearly not 100% motivated to "pay for performance". To some degree you are, clearly - but a large part of why you tip is cultural expectations, or you wouldn't be tipping 10% for horrendous service. Which is fine, I'd never not tip in Canada or the US either, but let's be honest with ourselves - everyone tips because you're culturally expected to tip.