I agree with your position. This is an aspect of the game which I had not expected from Dave after buying his earlier games. I believe that the PlayFirst arrangement is beneficial to him in a business sense, but it may not be so for his body of work. Unless, of course, his concern is only (rather than primarily) the money, which I think is unlikely.
That does bring up a central aspect of your posting, though: unless you're one of the gnomes who write "reviews" of games for online or printed game-related publications, you've already "supported" the game to the fullest extent possible: you gave PlayFirst money for it. Nothing else you do will reach a wide enough audience of potential PlayFirst customers to matter (remember, anyone reading this is almost certainly already on one side or the other of the PlayFirst/customer interaction).
So there's your support, all of it, right there: your money. And they've got it. That's blunt, but I certainly don't mean it as a rebuttal of your posting. As I said, I agree with your position. It's just that...well, it's too late for that position by the time you hand over the cash, unless you somehow get it back.