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Spamzoil is sold through what's referred to as "Multi Level Marketing", yes, just like Mary Kay or Amway. For that reason, and the fact that they're less than forthcoming with actual testing info, I don't use the stuff, though it may actually be OK.
I've switched many cars to synthetic well past 150K miles and have never had a problem.
Mobil 1 is hard to justify for a non-turbo junker, but both my 700 turbos(200K +) use it; my goal is to change it at ~10K miles and I usually make it past 8K before I change it, regardless.
See http://neptune.spacebears.com/cars/stories/oil-life.html
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