I hate it too. In fact, I’m against most forms of habitualized social behaviors for the sake of manners. That’s not to say that I don’t say please and thank you, but I try to make it a conscious choice to do so, so that it actually carries meaning, rather than just a habit. If it’s just a habit, it’s meaningless other than “our conversation is over”, but since there’s other ways to do that, I don’t see a point in the euphemism. Of course, I do occassionally catch myself saying things out of reflex, like “have a nice day”, and when I do, I make an effort to correct it.
The worst part is, because I tend to actually mean those phrases when I say them, that I am no longer really able to express that I really am thankful or that I really do want them to have a good day without trying to pick out an unusualy way to say it, but even then, that often comes across as being contrarian or trying to be unique rather than expressing what I want to express.
And by the same token, I carry this over into my personal relationships as well. I don’t apologize unless I’m actually sorry; I won’t say it just to make someone feel better. Similarly, I won’t forgive until I actually have, though that’s seldom an issue since I usually have already forgiven someone that I felt wronged me in some way by the time they apologize. And, this last one gets me into trouble a lot, but I absolutely won’t tell someone I love them out of habit either, the “I love you, bye bye” thing is at least as bad as “have a nice day, bye bye”, except now you’re washing that phrase of any meaning and it’s difficult to find meaningful ways to express that.
I digress, but I think the whole “thank you for doing business with us” is almost always unnecessary. In most cases, we’re doing business because we’re mutually benefitting from it, so there’s no grace to be established in the relationship. If one of us is only doing it at a loss of some sort (bad experience or whatever), why should I thank YOU for something that is relatively benefitting YOU more? OTOH, I can see thanking someone in the reverse, where it might just be another normal interaction for you but it helps me a lot, I can see thanking being in order, but that’s usually on the side of the customer, not the business.