I would think Batman and Spiderman would be the most ripped off in turns of sheer volume. Every single dodgy market stall I see that sells toys seems to have them, in some garish and bizarre products and styles. Usually very flimsy toys too. I did hear a customs guy though saying Disney products were, but they have stronger ip programs and work hand in hand with customs.
Maybe they need examples of KO and reporting to Hasbro customer service?
On the lookout for MISB Headmaster Highbrow, Takara or Hasbro. I'm sure I could make you a sweet deal!