I guess it depends on your philosophy on racing..... the guys who organise ultra races around the world are, in the main, commercial enterprises for two reasons.
One, there are next to no clubs who have the unpaid volunteer crew to be able to put on a multi-day extravaganza for next to nothing, such as the MdS, the Gobi, MOB and, in this case, the British Ultra. The most we can realistically expect is single or two-stage weekend ultras from these individuals.
Secondly, just as with many areas of 'adventure' racing, there are people out there who are willing to work hard to put on these races as a commercial venture and attempt to make a business out of what is a growing area of sport. Some are extremely expensive (eg. MdS) and others are more reasonably priced (eg. Trans Aq), but I don't think we can expect them to be put on for the same price (pro rata) as single stage ultras due to their nature.
I paid nearly 3k to run in this year's MdS and, when I add in the extras, such as race kit, food, training costs, etc. over the two years of prep for the race, it turned into one hellishly expensive exercise. But, then again, it was one of the greatest sporting experiences of my life and I don't begrudge paying huge sums for the incredible memories I will take with me to the grave. However, on the flip side, I love running in cheap and cheerful events too - the East Mids orienteering champs on Longshaw today cost about a tenner and was fab!
Yes, you can travel to Jura and Islay and do it with mates for maybe half the price, but for some that wouldn't be the same as sharing the camaraderie and competiton of a multi-stage ultra......