It's a preference thing. I wouldn't have done it if it were all matching parts. When I went to sell I still got around $325 for it.The detachable mags thing was just starting to come online back when I was tinkering with mine. There was a guy working on it but it looked like it was never going to happen. Sounds like things changed.
I had wanted to, but I never cut mine down and crowned it, which I'm sort of happy about in retrospect. Didn't tap the rear rail either. Just clamped scope rings to it. I'm sure it's not robust, but short of the damage to the finish from the torch to melt the silver solder out of the rear sight, mine could be put back to original if someone really wanted. I stopped before "Full Bubba" set in.
I do wonder what a sporter sells for these days. Maybe there isn't a value penalty at all?