And here-in lies the whole problem with Merlin. It doesn't seem to matter how much an attraction makes, they're all subjected to the same budget cuts and penny pinching. If anything, the way Merlin runs, parks seem to be better off when they make a little less money than expected!
Thorpe had a massive misfire with Swarm, and as a result they seemed to have loads of money invested into a new brand identity, X re-theme, Angry Birds, and Fright Nights. However, it still all comes back to Merlin budgeting. Thorpe could be making more money than any other park in the UK, but if it meant saving money they'd still only be given the budget to run one train on a lot of their rides.
Have you actually studied the budget, income and profit for the park?
I don't expect anyone on here has a deep enough understanding of the workings of the park and their labour costs to know if they are penny pinching or not.
I would expect on many of the quiet September weekdays they have to run on minimum staffing levels just to make a profit. 10 years ago Thorpe didn't even open on September weekdays.
At the beginning of the season people on this forum were complaining about Alton Towers and selective opening of food and beverage units. If the park has a fixed labour budget based on predicted guest numbers for a day, which would rather have, a two train operation or a food kiosk open?