My net worth is not quite that... but I also am 6'4" and can hardly move in an economy seat. Height is not the only factor - leg/torso proportions make a difference as well.

I always fly biz international and first domestic if at all possible. But I have never paid for a biz ticket and don't see doing it. As my biz flights are always personal (that sound funny...), I just keep looking until I find tickets before we make the rest of our travel plans.