When I purchased my .308, it was a Remy 700 VSS. I initially was going to buy a right handed model since I didn't think I would ever be able to find a left handed one. Plus I figured it would be better to learn on a righty since most rifles I would come across would be right handed.
Just when I was getting ready to make the purchase, a left handed one showed up so I picked that up instead. A lot of people I think choose right handed just to adapt, even if that would not really be their preference.
As evidence, I also give you this :LEFT HANDED for sale page - Sniper's Hide Forums
It is a thread dedicated to left handed rifles for sale on snipershide. I've seen some really nice GAP and other custom builds move through there.
The market might be small, but it IS there. The day I order a custom rifle, it WILL be left handed. I'm not going to drop that kind of coin on something that will look like a red headed step child.