The truth is that client machines are bigger computers than the servers. People talk about thin clients, or Network Computers. I think they're super-boring. But remember the power of the back door. That's how Apple IIs got into the corporate world in the early 80s.
Servers are specialized machines, but simple ones.
You might have a server that feeds out 50,000 web pages a day. It has 24 megabytes of memory and 512 megabytes of disk storage. A small crappy monitor. But it's nowhere near the power of a desktop machine. The pipes are getting bigger.