IT? Sure. IT is the guys that support the office printer and your outlook login. Useful people but it's hardly rocket science.
Software development contracting and consultancy is a very different matter and can easily get you into the top one or two percent of incomes in the UK.
The fact that a lot of small and medium businesses in the UK attempt to treat (and pay) the one as the other is part of the reason they're always bleating about not being able to find staff.