People miss the point about the high altitude training. The benefit is more psychological than physiological because it is a palpable demonstration of the culture that is built at successful clubs. It is an attitude of total commitment: "we will do everything in our power to improve, even if the improvement is almost immeasurable". The Lions were the same with their low flying planes and intravenous drips. The benefits of these things were probably negligible in physiological terms, but valuable in cultural statements about the club and what they stand for. It is more about belief in the process than the actual running power.
And it doesn't necessarily work to then imitate what others are doing. We need to find our own 'cutting edge'.