I think that's just the general case for wheeled machines in particular, especially anything modern.
That's a fair machine, I'd prefer a Steelwrist on it though

I put 4 15's into Flannery last year and as far as I heard they were getting on really well with them, although they had bought them specifically for lifting on HS2.
There was a really nice 714 for sale recently from the Netherlands, 710mm Nokian tyres etc, I think it sold for about £34k which would have been a bargain as it was one of the last built and had a lovely spec, albeit no tilty.