It's not the injury itself that gives you the big bucks, but the cost of everything you need to deal with it
Have you seen the cost of artificial legs these days? An
ottobock x3 will set you back £100k and has a lifespan of 5-7 years. You'll need other prosthetics at the same time like a waterproof one for showering
Some days you just won't be able to use the prosthetics so it'll be wheelchair time. Good thing your house has been adapted to cope with that
Even with the prosthetics, you'll need a lot of looking after and carers costs.
If that sounds good, an above knee amputation can be arranged. For the right price of course