Yeah you are missing something. EASA absolute limit is 1000 hours and the company target for a 100% employee is 850 hours with a limit of 900 hours a year. There are 12 months in a year. Do the maths. You can not be a pilot if you think 'only 75 hours a month' is not much.
These contractors have no basic pay - if they don't fly, they aren't paid. They are only paid per scheduled block hour. It's the ultimate in efficiency. They are a flying hour 'accumulator' - there to make up the shortfall.