Good point. I used to send users to that page to purchase, but now I send them directly to the store. On the other hand, I want users to know what they're getting into if they download a trial version ("wait, you mean it's not free?")
That would probably be a good thing to do an A/B test on. Everyone has an opinion (like me: "hey, I like the dollar sign! It's simple, clear, I recognize it instantly, and I hate web sites where when I want to give them money I have to go looking for how to do it!"), but measuring your conversion rate between the two options will tell you which one is actually better.