and discussing sex for money (or upselling as you put it) is a definate no-no.

Other than that I find a bit of flakiness very becoming sometimes.  It often bodes well for playfulness.

Any derogatory or racist comments would definately put me off however, but I don't think that's ever been a problem.

"I'll know it when I see it." Until then I've got better things to consider.

Things that make me delete...
The obvious, rude, crude sexually explicit
Asking for info that Is clearly stated in all my ads and website.
Telling me how much money you have and how you can "help me out"
Telling me you read on my website that I see men over 40 only but will I please see you, you are a very mature 20, please, please, please.
Telling me what a horrible time you had with the last provider, her real name and location.
Asking me for details of how our evening will go.
Telling me how you never get anything from the SO and how bitchy she is.
Typing in all caps.
Telling me you would love to see me at my place and it would be reallu special if I felt in the mood to cook for you. (this is reserved for very special regulars
Asking for my real name, my location, what is my real job, and all before I have even agreed to see you.
And if you sound like you are writing a love letter, looking for a long term relationship...
And yea, this one was really funny... "I can tell by your pictures that you don't have diseases like most of these women, well, I'm planning on using a rubber but I know I can trust you." Ok bud, using a condom is not optional and, oh, nevermind, just delete.
I could go on and on but I think you get the point.
I appreciate the men who introduce themselves, name, age, when they will be in town, an approximate day and time for an appointment.

1: haggling with my rates
2: one liner for intro email
3: no name anywhere in the email
4: explicit requests before being screened
5: asking to book LESS than an hour
6: offers to send me to Africa and pay me in EUR