To me, Scalping is when you can't buy a hard to find item (TF, Concert tickets, whatever) because someone else has bought them solely to make a profit by selling them to people who missed out/couldn't find them.

Buying some toys for investment is fine but I wouldn't be impressed when it prevents others from buying them. For example, in the instance of the City Commander kit say there were only 10 available, and the first board member to see it bought 10, kept one and put the other 9 up on ebay and 9 other board members missed out. I would call that person a scalper. Fortuntely in this example the preorder requests came first to ensure there were enough kits to meet the demand.