Fines, as they are now, will be determined on a basis of ability to pay, so those on low incomes will still receive low fines while those on higher incomes could face costlier penalties.

I'd guess this is a measure to hit those who can afford it a bit harder, we've heard many times of well know wealthy people getting off with a £2,000 fine which we know is peanuts to them. Well for many £10,000 is peanuts but at least it will add a bit more to the coffers!