If it's me you're talking about, I'm not an LBS owner yet - but hope to be by march.
And as soon as there's money for it, I'll be getting this tool, a BB thread cutter/facer and a headtube facer. Purely on the basis that nobody near me has them!
Even back in 95 when I started out in the bike trade in this country, it was damn near impossible to find a shop with the tools to do this.
Last place I worked we prepped everything before building. Just the act of doing it means the whole frame gets a really thorough checkover before you waste time putting bits on a frame that wasn't built properly. Saves a lot of time at the other end too.