Easyjet is a business whose primary aim is to make a profit. Turnover is not the same as profit.
Aircraft cost money and like any airline they must be deployed in the most effective way possible to maximise profit. Passenger numbers are incidental in comparison.
I see an airline that has significantly raised the number of pax per flight (ie load factor) over the years and mamaged to free up aircraft for other in demand routes instead.
Commercial aviation spends far too much time bragging about the biggest network or flett but seems to ignore that elusive concept of return on capital