I think there's two things to factor in here.
The first is that BGW's primary goal with this pricing is to drive membership—the highest the cost of single-day tickets, the more people will realize they can save money on parking, and potentially return next year. Christmas Town is already a huge function of this since there isn't the cheaper option of full-season Fun Cards (or, typically, preschool passes), and I think on a corporate level one of the main benefits of being open right now is trying to drive revenue for 2021 as much as making money in the short term.
The second is that I think even with the expanded capacity, the park feels confident there are 4000 people who are either already members, willing to become members, or willing to pay prices comparable to the day-of sales from past Christmas Town events. Now, as to whether that's actually a good value proposition, I would argue it's not, but I think people's perception of value is shifting in the context of our current situation. If this is one of the one forms of holiday entertainment that's available, whether as a slice of normalcy or as a family ritual that can be safely executed, I think they're counting on people being willing to pay for that in ways they might not have under normal circumstances.
Now, these two factors absolutely mean that there will be people who are priced out of Christmas Town. And if sales seem to be slow in a couple of weeks, I think you might see them do a Black Friday deal on tickets more similar to the advance tickets deals from past years (which are of course designed to lock in people who might otherwise choose not to visit the park due to inclement weather). But I think the market is there for what they're offering, even I agree that customer satisfaction is going to be a bit of a question mark (especially since I'm seeing reports of 45 minute waits tonight and they're selling Quick Queues now apparently).