Changing Ads: probably fine at most linklists. wouldn't do it with tgp's though.
Nuking Recips: Also probably fine, but give it plenty of time before you do as Bjoofs said. I'm about 3 weeks out on reviews, and some are even longer.
Build and Forget: I'm in the enemy camp on this one. If you structure your domains, links, hubs and target keywords carefully, you can get some valuable SE listings with free sites. I say track your old sites and make sure you're not sending good, targeted SE traffic to someone that's not paying you anymore, or an affiliates site whose conversions sucketh.
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