Of course that's fine but even in games where an advantage can be statistically demonstrated there are still people who prefer the theoretically disadvantaged side. The easiest way for me to express it is in shogi terms where the colour terms 'sente' and 'gote' are inextricably linked with a player's style ie attacking or defending respectively. Likewise with many of these games a player's preference or talent might find it's most suitable medium in the unpopular colour, it could just be that there are less of those people, like the left handed. I like to play a balanced range of colours but I wouldn't want it to be compulsory.