If it requires a CC, I've only had success with free trials that had $70+ payouts. We're talking free 1 month trial, $1.95 shipping. I ran a bunch of them with $30 payouts and was never able to profit. I probably could have optimized, but it was difficult to do with a thousand clicks and 0-1 sales.
Was this PPC traffic?
Software can good for trials but harder to track.