Park entry is around £40 per day, they don't do BOGOF but do have the early season offer of 2 days for the price of one. It's not cheap, it's not horrendous, it's well priced.
People will generally be willing to part with their money when they are happy, cup of coffee here, lunch there, snack on the way out, meeeeeeerch. I'm pretty sure the most I spent in a park recently was at PL, and I didn't care at all. Everything was reasonably priced and good quality.
Except the hotel buffet, man that stung, but supply/demand.