Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
You don't get something for nothing. More volume requires more energy, but I doubt that it shortens battery life noticeably.
 
Hardly.

Even if it does, I can't compromise by not being able to hear the ringer. That defeats the purpose of a phone.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.