In all seriousness, what did you guys expect here?
It was an exclusive set. That means a limited number of products available, and the offer was open to a lot of regions worldwide rather than just for those who attended one select event.
Of course it was going to be popular. Of course it was going to be highly sought-after. Of course it sold quickly. Of course the people who were lurking in wait refreshing the page as the final seconds ticked by were the ones who got it.
The existence of scalpers is unfortunate, but you can't blame Mega or Mattel for it. They had a narrow window to plan and prepare to sell and distribute this online considering they'd spent who knows how many months preparing for SDCC instead.
As a community, we should be thankful this set was made available at all given everything that's going on in the world right now.