I don't want to start a debate about the word "investing" in regard to Lego (again), but there's a big difference between the time frame of investments vs. arbitrage/flipping. Yes, the online selling is a gold rush right now, but not many have patience for the big payoff. I only call something an investment if I'm willing to hold it for five years. What are you willing to hold for five years?
I stand by my assertion that the rate of "arbitrage" online has changed the Lego landscape more than anything--and it isn't just Lego reselling. It's everything. I've only been a member here for a little under 2 1/2 years, but the conversation and focus on flipping has shifted even in that time. Either everyone wants the quick money, or the long term folks are just keeping quiet.