People like you make me sick. First, even with garrison money, I would not want to spend more than 5000 for a skill upgrade which I have already invested like 250K into over all my characters - mounts are not even in these costs. They already count into some millions.
Second, you seem to have forgotten that many people in BC could not afford flying and were having problems accessing flying content. This should never be repeated. Especially not in the current state of game, when it constantly needs an influx of new players to maintain the numbers, and these new players surely would not be able to afford expensive flying.
NO. This is stupid. They already gate flying behind an achievement. Increasing costs would not help anybody but some sick fucks who like to destroy fun of other people just because they religiously believe that they are right.