Is Yahoo PPC even worth the time and effort?

I’ve been doing ppc on an off for years mostly with adwords.
I tried MSN with dismal results and now I’m wondering if I should try Yahoo as they keep trying to entice me with a $50 credit in my email.
I like to ride the wave of a sure thing and for me, Google is far more reliable in terms of traffic.
Is it really worth the time setting up the campaigns,tweaking, sales page split testing, etc etc with Yahoo? I’ve read in the past you had to wait days before you could even have your account setup if you chose not to pay the $199 fee they charged (Hmmm..I wonder if they still charge that fee?)
I really would appreciate your feedback about your success, blunders and anything in between.
Thanks

Original post by braver55b