When she first started in this business Thumper, she was VERY selective with her clients. A girl has a right to pick who she'll see. From your comments above, sounds like you've got some anger issues, so she probably made the right choice in not seeing you. Cash cow or not. Some girls just can't "fake" it and pretend to be interested and enjoy every guy. At least she didn't tell you that you're ugly.. Every girl in this business does some type of screening. Whether it was because you were too old or some other reason that she choose not to see you.. the choice is hers.
For those that have seen her, you can read their opinion here. She's one of the best blowjob talents around. On top of that she's truly a friendly, fun down to earth girl.
Bottom line, if you can get past her screening process you won't ever regret seeing Nikki. It's well worth it.