[vjk800]

1) Even if it doesn't improve performance, athletes might still think it does and try to get the asthma medication. It might surprise you how much lore and voodoo surrounds professional sports. People are willing to try almost anything if it has even a small chance to improve performance by 1%. Also, both of the studies you linked are quite new. Athletes have been obtaining (possibly false) asthma diagnoses for decades.

2) Maybe they don't use normal doses. As long as they get the prescription, they can take however much they want, right?

3) A few studies might not be enough to thoroughly prove that there's no effect under all possible circumstances. Again, as long as there is even a small amount of hope of it helping, many athletes are willing to try it.