Thats what, say, £500 for paint and £1000 for wheels... the paint probably adds nothing to the lease cost and the wheels are £40 per month.
£40 per month... I'd have to really hate looking at those 18's... I mean, REALLY hate looking at them to be giving £40 a month to someone for them.
I'd feel happier buying my own 19's and swapping them over - at least I'd have a set of wheels I'd paid for at the end for that.