That's very odd...
Yep, I've switched both my major sites to blue style and changed infolinks color to #0000ff (matching the other links), so I was expecting to maybe "double" my CTR; instead, CTR dropped like 0.1% and ecpm almost tripled... very odd stuff if you ask me.
My site is currently the default green with double underline. Yesterday I got 3 clicks (with only 20 visitors in all) and I got $1.59 :)
I just Signed up recently though I haven't put them on my site yet:doh:
Wish I could select diff category and color for each site without contacting them each time.
It's universal.. Maybe you guys should opt for different accounts..