It's worth however much someone's prepared to pay for it! Low production run, V6's generally, probably in 'as new' condition.
Hardly a 182, where there's one around every other corner.
Personally, I wouldnt pay £2k + extra for a LY vee.. However, if the Moonlight Blue Vee for example came up I would be prepared to pay a premium. These are specialist cars for a specialist market and prices are always going to vary hugely depending on condition, mileage, history, and colour.
If your in the market for an 'as new' Illiad Blue V6 with ultra low mileage, you'd have to ask yourself.. when is another example like this going to be available to buy?
It could be a long wait!