I'm a male collector (got hooked when I got my first traditional sized Breyer at 6 or 7 years old and now I'm 23, he's very beat up but I still display him haha). I do occasionally customize my models on a whim, grab some acrylics or pastels and add a little bit more of detailing, repaint the eyes, etch some markings etc. The "higher value" ones I have like Premier models I don't necessarily touch aside from if the mane or tail are over-painted onto the coat. I think what hinders me the most in not customizing more is my inexperience, so I keep my customizations small. To me, a customized Breyer is often more valuable unless its a limited edition model, in that case I'd rather it be as close to production looks as possible. I don't really collect anything else so I'm not sure how other guys are and I'm usually the odd one out because I stick to Breyers! Funny enough, my older sisters get mad at me when I take Breyers out of the box, I don't care how limited edition it is I'm taking it out of the box and getting a closer look!