Excellent points and theory. From a site standpoint, I think this helps prolong the life of LEGO investing. In a way, it has put a damper on the entire world of LEGO investing and some can argue that is a good thing. Your point about LEGO doing this to actually help the LEGO secondary market remain viable opens up a whole new way of viewing this banning situation. Maybe by cooling down the market, it removes some of the tire kickers and dilettante investors from the mix, preventing a speculative bubble from ever forming.
Unfortunately, we never see "big hitters" buy that many sets. Either people are full of crap or avoid our affiliate links for something else. It's a shame, because eventually, those members who never want to click on our links to support the site will find that we will have to charge for this data. Throwing us a bone once in awhile keeps the site free.
From a personal standpoint, I miss the discounts on big sets from an affiliate point of view and personal buying aspect. If people are buying less big sets, then we make less money. Also, I have to pay more for the ones I buy as well. Restrictive limits are a nuisance to me. I really spread my investments around, but I do feel for people wanting to buy large quantities of sets. If they buy within the given limits, then they should not be banned. This is just a silly topic in general...I mean...a company complaining about people buying their products. LOL