Well you could set it up that they have to have X amount of time and posts before they are added to another user group which at the time will then allow them to download the files.
Currently on my site, I have it setup that when you register you are a Junior Member, after about 10 posts and 5 days on the site, you are automatically changed to a Member which you have more access on the site. You can setup a very similar thing using User Ranks. I believe I used a hack to get the default registration membergroup setup.
As for your initial question, you can prune members by their posts or age on site. Check in the admincp under users I believe.
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