I'm just wondering if my experience with AdCenter is similar to what others are seeing ...

So far this month, my AdCenter traffic is about 1/10th my Adwords traffic, and my AdCenter traffic costs over 50% more. This is for the exact same keywords and ads, same bidding strategies used, etc.

I'm barely making a positive ROI from AdCenter and the really low volume has me thinking it's not worth my time.

Another oddity is the way my ROI from AdCenter fluctuates so much on a day to day basis. One day it will be decent, the next day it's actually negative, etc. Both Google and Yahoo are very steady on a day to day basis.

Conversions from AdCenter traffic is actually slighter higher than both Google and Yahoo, however the fact that my AdCenter ads cost 50%+ more nullifies that real quick.

The only thing I can think of to get more traffic from MSN is to use more phrase and/or broad matches, but I assume this will only lower my ROI even more. I won't know until I test it, but I'm pretty sure that's what will happen.

Is my experience with AdCenter similar to yours?

Well MSN search volumes seem to have gone down the pan this month in particular for me. There does seem to be a lot of competition on keywords forcing prices up, my guess is it has become 'swamped' with google slap victims looking for a new advertising platform?