Just value I guess, but when I say 'rougher' I don't really do anything manual - more if I go on a motorbike trip for example. The Rolex is White Gold and on alligator, whilst the JLC steel on kevlar - I won't be scared away from wearing a watch for anything, but in my opinion, you should be sensible, just as I wouldn't wear any vintage watch for the same purpose.
And thanks all - great welcome!