Why is the Wizarding World chocolate/candy so bad?

I swear it's the worst chocolate I've ever eaten, and the most expensive. It's as much a souvenir as anything else, Honeydukes chocolate should be amazing! Have they stingily produced the worst stuff cos they know people will still buy it? I mainly got it for the tin, but if I'm paying 30$ for a chocolate frog, I want proper chocolate too. I remember getting Fizzing Whizzbees at the HP Warner Bros Studios in London and they weren't great either.