It depends on your circumstances.
£100k = £150-£200k to be made pre-tax, which I find a huge amount.
The issue I have with all of this is that flying is rapidly becoming the preserve of those with more money than sense. You can't get past the first hurdle if you don't have the cash for OAA/ TR/ etc., and ultimately this will translate into poorer piloting skills, and it shows how little airlines value flightcrew.