X is the moment scalpers buy up the remaining market and set their own prices now that they control the supply. They know many other ticket holders can't compete with them since they paid more money for their ticket.
The point of auctions is that the right strategy is to bid to your price, not to try to guess what other people think the price should be. That's why they work.
In theory, there may have been holdouts who wanted to get a better price, as you are suggesting, who then turn to the scalpers. Those holdouts are either (a) irrational for not bidding the price they were willing to pay or (b) not actually willing to pay whatever price the scalpers want to get.
By taking this strategy of picking a demand level X and buying out all the tickets once the supply is below that level, scalpers are virtually guaranteed to lose money.
For most goods, there is no demand that is independent of price.
