Well I have a cropped dog, so I'm sure you guys know my opinion.
For me personally, I see no point in cropping a pet dog (as can be seen by my two dogs that are pets that have natural ears). Except for a Dobe.. if I had a Dobe, even if it would just be a pet dog and never show, it'd be cropped/docked because I think they look like Coonhounds if left natural.
I had Sako's ears cropped because #1, I like how Amstaffs look cropped, and #2, just about everyone crops Amstaffs. Natural earred dogs are pretty rare, breeders in the US don't breed for "nice" ears, so it's just easier to crop. Any future Amstaff I have will be cropped.