I see what you're saying ShadowLink, but appealing to more players is a valid goal.
1 - Statistically, the more players you have, the more competition and top level players you'll get.
2 - Parity is something employed to increase relative competitiveness - look at the professional sports. There are not really dynasties anymore, but it's still just as exciting, because fans of more teams think their team has a chance. Measures like salary caps, etc. are taken to even the playing field.
Similarly, when Pro-Ban people argue that more viable characters in the tourney scene is better, they are arguing that parity will grow and diversify the community more than it would otherwise be.
I understand your point of view, just don't dismiss Pro-Ban as being anti-competitive, because it's not. To many people, it's more competitive, and more interesting.