Yep, everyone has a different level due to their experience in life. Many times I've read a post where they comment about their sub shakes the whole apartment complex, and they're talking about their 8" model with a 200 watt plate amp. Now take that person and have him listen to a system with 16 or so 18" drivers, each with 3" of excursion powered by a 6K watt amp, and their frame of reference changes forever.That is the best explaniation I have heard. It makes total sence to me when you put it that way. :T
Like the old quote says, "Contentment is destroyed by comparison"