Why do you play High Bounty?

[IlPalazzo]

So why not fix these imbalances?

Because it is hb.
Balancing is not done for hb

Meh, that's the game's loss really... To leave a popular mode imbalanced as such.

Really, if hb is faster it is because noob-leaver/non feeded players leave earlier...

No, even without that it's generally 10-15 minutes shorter... Like I said, in the same way that weak creeps is quicker. The players progress through the game at faster pace than the force creeps, making it easier to destroy towers and base buildings than in normal. Riding creep waves and using towers become less relevant after 30 minutes or so.