The trouble is a lot of people on here judge what they consider to be a well turned out machine using an OCD benchmark. Most cyclists, like most car owners, simply can't be arsed to spend half their spare time cleaning bits with a toothbrush and polishing it until they can see their face in the shiny bits.
I'm not condoning outright mechanical neglect, but let's not get too carried away about cosmetic appearances. I run some horribly scruffy bikes that many on here probably wouldn't be seen dead on, but they are all still mechanically adjusted and get a squirt of oil and a pump of air when required.
The riders knocking around on obviously neglected fairly expensive bikes are simply wasting money, and more fool them if they are dumb enough to do it. If they had any sense they would run a skip bike or something similar dirt cheap instead, as it would still get them from A to B at a fraction of the cost. Some people are just mugs with more money than sense, but whilst they have the absolute right to be mugs, we also have the absolute right to laugh at them for it.