I agree with DB. As brandable domains they seem fine, but obviously there are an awful lot of equally brandable alternatives. That these were available for registration shows their lack of any obvious perceived value.
With this in mind you could try to turn them into successful websites, and then of course there would be some value - but to do this would require a totally different set of business skills.
Most people register domains like this when they first get involved in domaining. From there they either move into acquisition of prime generics (having decided there is no quick money in 100beef.co.uk), or web development, or a mixture of the two. Rarely have I seen anyone make good money (a living) from trading brandable domains as opposed to generics.