I beg to differ.
As long as Wacken is sold out, Wacken United does not matter.
However, what happens if not all Wacken tickets are sold out? The “sold out” tag on the Webpage is not a god given fact, see e.g. the ticket numbers for Rock am Ring this year.
To put this into perspective: The turnover for 300 day-passes (~100€ each) and 500 4-day-passes (400€ each) for Wacken Divided, I’m sorry I mean Wacken United, is in the order of 233 k€. This additional turnover vanishes as soon as ~780 tickets for 300€ are not sold.
Thus, if a small market is served at the expense of the bulk of customers (and not everyone is happy wiht the development of the festival, see above), the latter being the cash cow of the festival, the total turnover, and typically also the profit, may go down drastically.
So serving every demand is not always the way to go