Also, do you genuinely feel that your work deserves such a great reward?
I do, personally.
Especially when you consider what some of my non-IT peers in the finance sector earn vs. what they have done/must do to earn it. I won't insult you by pretending I deserve to earn 10x what a nurse does, but in terms of my employer and the sector, I don't think I'm particularly well rewarded.
I think this is one of the things women suffer from most ("I don't deserve this" / imposter syndrome), and it's one of the things that feeds into their unwillingness to negotiate salaries or demand extra reward for extra value that they bring. It needs to change.
To get where I am (in a highly specialised, technical field which is very male dominated) there are relatively high barriers. Perhaps IT doesn't have the same specific barriers that law, accountancy, medical careers (etc) have, but in my career I have undertaken two degrees, work horrific hours near project deadlines, deal with an immense amount of stress, and have managed projects going into millions of pounds worth of investment.
It's also high risk (technically), because it's for a financial services company, and there's the boredom factor - I've seen graduates literally nod off in meetings as most people either can't overcome how dry the environment's subject matter is, or can't fake it enough to look like they've overcome it.
Hence the burnout rate before the 5 year mark. Those that stick with it beyond that are worth their weight in gold - what you pay a more junior employee, and the value they bring, is much more trivial... senior employees, being paid 10x more than those just starting out in their careers, often save the projects I work on many, many man hours of junior time, and should be rewarded to recognise that. IMHO.
You also have to factor in the massive rate of change in the IT industry, technically speaking, and the amount of business knowledge that I have to keep up with. Lower level programmers can perhaps get away with learning new modelling techniques or a new platform every year - I can't. As a senior level manager, my knowledge extends beyond the nitty gritty details of what junior level employees need to keep on top of. As owner of a specific expertise (in technology and business terms), heading up a team, I need to be ahead of where our training is by several steps, and lead the team strategically. So - yes - when I see a senior level HR manager (for example) earning £120k on the floor below me, comparing the value I add to my organisation in comparison, you can be damn sure I feel like my salary is justified. As I said earlier, undervaluation of one's skills and value is a key factor holding women back.
We need to instill the same level of confidence (and awareness) of this in our DDs to allow this cycle to break at a faster pace than it is currently doing. It's one of the reasons I'm actively involved in several women in SET (science, engineering and technology) groups - if the current generation of senior management role models aren't visible and actively participating in fixing this, there's no hope, really.