Virtually every year it is cheaper for me to insure several bikes separately than on a multibike policy, surely the purpose of these is to save you money, so as far as I can see the only benefit is getting round the issue of earning separate NCB on each bike. Most insurers have a policy limit on the value of bikes on cover and most multibike underwriters don't want several quite new valuable bikes as this exceeds the value limit. A mate of mine has 12 big bikes 3-10 years old on cover for less than another mates 3 newer bikes, as riders they are of similar risk profile, so it is largely down to value when you get to a certain age. A few months back when I was considering a 1000 versys, the quote for a 650 versys of similar value was only £20 a year less from a dozen or more insurers even though there is a considerable difference in the performance of these bikes.