Just a few more facts to confuse your calculations.
Movie (film) run at 24 fps and appear flicker free.
There is some issue with epileptics and 40 Hz strobes.
Some people complain about monitor flicker if the refresh rate is under 70 Hz.
As for 30 Hz (interlace) TV versus 70 Hz computer monitors. There are two issues. One is the interlacing, and the other is the phosphor decay rate. Scan line interlacing is a cheat to try and get an effective 60 Hz image. Also, some phosphor grow dim faster (decay rate) than others.
There is also a electron flooding techniques that helps maintain the phosphor life, but reduces the screen contrast. I don't believe anything built today uses it anymore... ooops I started rambling.
[This message has been edited by Iam2 (edited October 22, 2002).]