I've often wondered this myself. PRS has the SE line, Fender has the Squier line - both have their respective headstock shapes but have easily recognizable marks/logos etc. that identify them as their budget/made outside of the US line of guitars. Epiphone could easily do the same. Honestly the main reasons I wouldn't buy an Epiphone Les Paul is the headstock. Not because it doesn't say Gibson but because the shape is ugly. If it was the Gibson shape but said Epiphone I'd be fine with it.