Ok, am I then wrong to say the reason why I got the mac pro is because I thought it was as upgradable as when I got a Power Mac G5 back in the day? In other words, when the bulk of consumers bought the power mac towers back in the day?
You don't see 90 percent of the consumers buying mac pros like they did the Power Mac G4 or G5, Right?
err 90 percent of consumers didn't ever buy the PowerMac G5s... 90% of prosumers may've done, but most consumers bought the iMac - hence it being a runaway success.
1) The iMac is even more capable than before, especially at the high-end and
2) The Mac Pro is more expensive, and is specifically designed for professional uses. Not consumer uses. Certainly not gaming/nearly all of your use. You are in a massive minority in that you could do all your computing on a Mac Mini/iMac, yet have a Mac Pro out of choice/hoping it'll last longer/etc etc. Most of us have them because we need all the storage expandability or the expansion slots right here, right now to get stuff done.