On the basis of economics, careful framing instead of cropping gets you to use more of the silver you have paid money for and as there is less enlargement there is greater image quality

Personally, I loathe cropping my work and it makes me realise I was inattentive when making the picture - This is my personal opinion and applies to my work, so I am not telling you you should be ashamed of cropping, even 'though you should be