In short, I'd say no. Quite often it messes up the operation and causes all kinds of additional costs whether that be surface transport or hotac.
Where frequency is quite high and low loads/delays/cancellations combined you are bound to get conspiracy theories. You get those on a normal day.
Quite honestly though, in 4.5 years at Easyjet I have never had any of my sectors cancelled. That said, I never had any cancelled at my previous airline either.