The difficult balancing act to make is how long you actually keep an airframe as a billboard. Essentially preservation should be about doing that – house her and your doing that but you loose the billboard appeal . However are the public savvy enough to either appreciate the benefits of keeping a Vulcan inside or does the draw of outside display outweigh that. Certainly if she has helped in the long term preservation of other aircraft it has been to the good – however even as a billboard she needs some kind of maintainace
and keeping in some kind of presentable order – that costs with an aircraft of the size of a Vulcan .
As for other machines – preserving in numbers was seen in the 1960’s as a means of ensuring that we didn’t end up in the same position of having no representative types such as the Whitley and Hampden . It has in a number of cases had a negative effect – resources have been spread on types which are duplicated to a large degree such as the Mystere while pertinent home grown types have suffered.

Just launched a new thread to deal with this sort of thing… leave this thread for the Vulcan fanatics…. (and roof enthusiasts….)