I would disagree. Walmart has been unable to keep the items in stock online, frequently selling out, causing Mattel to have to increase production. Once the Netflix series hits, and then the ongoing cartoon, I think its going to go gang busters.
The price point for these figures is really really cheap compared to other action figure lines.
Many people are reporting finding it difficult to find the figures, as collectors are mass buying whole cases then flipping them for higher prices on eBay. The market will bear it, we just need to see it released internationally. UK now has it and is selling well, and I suspect South American countries (where there is more MOTU appeal) will be quite profitable. That they?re willing to produce Castle Greyskull tells me that the figure sales are strong.
On the lookout for MISB Headmaster Highbrow, Takara or Hasbro. I'm sure I could make you a sweet deal!