I mean, if people like solid nose doors, molded on grabs, etc... well, hooray for a robust marketplace, eh?
I'd rather run my Katos at a show over my ScaleTrains, least I know if little hands touch them, they wont get the details broken off.
I have yet to sell any of my Katos that my ST's replaced as they are smooth runners just the same. I just don't mix and match them.
But yes, its nice to have options that are worth the money either way.