Of course the OEM Ohlins stuff is much cheaper than the race stuff, and as several posters so inclined to point out the obvious said, it is sufficient for the overwhelming majority of purchasers of the products they come on.
Showa is also very active in MotoGP suspension (Bautista's RC213V for one). In SBK (STK 600/1000, Supersport, SBK), there are ton of different companies that provide suspension to different teams, Showa, Kayaba, Bitubo, Marzocchi, WP, FG Gubellini, etc.