I know, and it bothers me too. That's why I put in the part about not being able to join again if you don't meet your obligation. I don't think that there is any way to completely knock out the drop outs, but I thought that this method might at least reduce the number to something more manageable. I think a lot of people mean to do it, but something comes up or they can't foot the postage or whatever and end up not doing it...
It's cool either way, and I don't want to pressure you in any way, but I did want to say that you're not the only one who is concerned about drop-outs.