Battery degradation is not that big of an isue as atleast in VW cars you get a pretty long warranty on the car battery. VW cover 70% capacity retention at 8 years or 100K miles. I will say they do lose value, but if you can charge at home, the off peak rates make it worth it. When my partner charges their car at off peak we pay 3.6p a kwh in electricity for the full house.
Per mile that works out to between 0.9 – 1.2p a mile, plus all the savings on electricity on the rest of our house.