Why do some studies lie about the pay ?

I just did a study it said it paid over 200 an hour and it would take a minute. Ended up taking 40 minutes and only pays 6 dollars. How dare they dissapoint me like that 🙁 I'm kinda ok with 6 dollars for 40 minutes but I just don't like the lie. Is it an error, or do they do this on purpose?