I've no idea what Suite101 is, but everyone on Hubpages is suffering a lose from Adsense earnings right now. At least most everyone is. Hubpages does have their new Hubpages ad program now though, and personally, I'm doing "okay" with that.
I don't know about moving all of your articles to hubpages - that could be a good idea, but it could also be a very bad idea; I suppose it depends on a number of things. I'm told that an older original publication date is favorable for search engine traffic - and you would lose that, obviously.