On the whole there might be, but I'm not sure of that. In the current situation, yes, because there is a cost associated with having to support two kinds of driving styles.

I have both 'LHD' and 'RHD' cars and find that I can switch at will, but most people are uncomfortable in the 'wrong' kind of car because it messes up your overview when overtaking on 'b' roads (two laners).

If everybody would be driving the same kind of car on the same kind of road then that problem would go away.