I've showed up to appointments, and immediately needed a drink. Does that count?
I can't really blame them. They're working, and it's often tough to deal with drunk clients in any business. The amount you drank is irrelevant - they have no idea of what you're like when you're buzzed. I can imagine a provider-only thread titled 'horror stories of drunk clients' would be as good as any of our 'horror stories of stoned providers.'
That being said - I've done it on occasion, I've done it sometimes after getting to know a girl, and I've gotten drunk to forget appointments, with sporadic success. My point - I can't fault a provider for preferring sober clients. In fact, that also seems to imply that I'd be able to count on her being sober as well - that's a high bar for some of these girls to clear!
In my business, I prefer my clients are sober as well.