Why do some volume controls start at -80db or..?

I tried searching but could not find a thread on this subject.
What is the deal with some volume controls having zero at the half way point on the knob? Our Yamaha receiver starts at -60db or some such, with 0db about the half way point. My Krell pre goes from zero to 150. For what purpose does this serve? I really prefer the zero to a zillion version. The minus thing is annoying.
Jeez, I'am sounding like Andy Rooney :') (RIP)
Interesting responses, most times the numbers on a volume control or attenuater mean little. Keep in mind, attenuate simple means a reduction of amplitude of oscillation, so removing the volume control from the circuit would give you full power.