1) According to the_logos on another thread, Aardwolf sells ""trivia points" for $2/point, and "quest points" at a rate of 25 per $1."
Quest Points get you more access to all of this , and that equipment "is very powerful and often contains special powers such as permanent haste or sanctuary." can get you custom favors other than equipment. Thus, if the_logos's data is correct (I have not independently confirmed this.. if someone from Aardwolf is around, I'd appreciate it), Aardwolf is pay-for-perks, just like IRE, and would check "optional fees".
2) IRE would check only the "optional fees" box. Threshold has a mandatory one-time fee, and is pay-for-perks afterwards. MUD2 has a recurring fee.
So far, all of those fit neatly into one of the four boxes I've proposed.
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