Amazingly enough, I got 2 clients to go back on plan last year within a few weeks of each other. I don't know what I did differently, but I did make note in my newsletter that the sweet deal Sage was offering to 4.10 people was expiring soon - and both clients fit into that deal. I'm going to try the same thing next summer for 4.20 people, if Sage runs the deal again.
I think it was just that the economy is picking up here.