Yeah options were always the same. I work in finance so am pretty cute with stuff like this.
It does make sense from VW's point of view if you think about it...take 2 scenarios;
1. List price £27000, discount given - nil, GFV - £13000, so the balance to finance is £14000 @ 6.2%
2. List price £27000, discount given - £3000, GFV - £13000, so balance to finance is £11000 @ 6.2%
Effectively they are losing out on 6.2% interest for £3000 because of discount given.
However, if GFV is lowered based on list price less discount given, they can finance a larger amount therefore making more money.