Lets see.  Since I added my conversion checking code roughly 6% of all visitors (and 10%ish of the ones I pay for) actually download a trial.  That means I’m paying about $1 per trial download.  To make any money at that rate at all, I need to have a conversion of trial downloads to purchasers above 5%.  Thats doable but challenging — I really need to work on my landing pages I think.