how about, you need a carbon fiber tripod which cost hundreds of dollars... and the 20 dollar one I have that works perfectly fine is crud.
Absolutes are always wrong.
It might be true if you are using the $20 tripod and expect to use it for holding a camera and long lens still enough to take 1/10 sec exposures with a 400mm lens and no IS.
I tried to use a old heavy Aluminum Bogen Tripod with the big ball head for my 40D and Tamron 200-500. There was no way I could hold that combination still enough to take sharp 1/10 sec exposures at 500mm. But with my even bigger carbon fiber tripod and Kirk Head, its just barely possible if I'm very careful.
It depends on the situation.
Even more of a issue is users with a 48 inch tripod cranking up the center column to get the camera viewfinder to eye level. Then, it doesn't matter how much the tripod costs, its very likely going to shake.