One potential thing is that Thorpe might be getting a lot of amount of this through the advertising.
Taking up the marquee for the best part of two months means it's unlikely they'll be able to use that space for private events (unless it's super easy to dismantle the 'exhibits'). The marquee is a good way for the park to make a lot of extra revenue - it makes more than most would expect.
If they're losing that, they're definitely going to be making the money up in other ways, and it won't be from the VR upcharge things they have. They're probably making money from using the space for gaming tournaments, some companies are likely paying Thorpe to have their products on show in prime locations. I'd imagine it would be a good pitch - Thorpe approaches these companies and says "we're having a gaming event at the park, we're having x,y,z there, would you be interested? For this amount of money, we can make you the headliner of the event..."
I'm not saying that is what happening, but I imagine that's a likely outcome.
This isn't going to push anyone away. No one is going "I WAS going to go to Thorpe Park this year, but they've got a gaming event in one small section of the park, so nah, screw that". It might mean people choose not to visit "Oh, I went to Thorpe a while back, should I go this year? Oh, they've got a gaming event on, that doesn't interest me, I'll hold off and visit somewhere else for now."
On the flipside, it's possible this might attract people - but based on social media reaction, that number is minimal at best.