So, to give some insight: Shampoo is for your scalp, conditioner is for your hair.
However, two things happens when you use shampoo. First, while it basically helps your scalp, it causes the small scales on the keratin(your hair) to stand up, which is why a lot of people who use shampoo on longer hair end up with frizzy hair after shampooing. Second, some people's bodies see the the lack of oil on the scalp as a deficiency and start over producing. That is why if some people use regular shampoo on their hair regularly, they can end up with greasy hair if not shampooing for a day, or bad dandruff. After changing to a new semi-regular shampoo cycle, the hair will be far less oily after 2-3 days then it was the following morning on a daily shampoo cycle. The first is actually why conditioner was originally created, as it uses artificial oils to smooth the scales on keratin back down. The last decade or so has seen manufacturers adding minerals and vitamins to conditioner, which may help or may do nothing.
This is on a per person level. The whole "NEVER USE SHAMPOO" thing is a bit extreme, but shampooing every day is not always the best idea. This is not the same as not washing your hair regularly, as that's just bad.
If you find that you're ending up with greasy hair regularly even if you're shampooing, you very well may be overshampooing for your body type. And while there aren't enough studies yet to say conclusively, it is currently believed that yes, this can cause hair loss for some people.
Before anyone dramatically shifts their hygiene routing, always consult your doctor. The hair loss could be genetic, and the greasiness could just be from a diet issue.
Or you could start shampooing every 2-3 days and find that your hair is healthier, it all depends on the person.
I have had shoulder length hair for about 11 years now that I like to keep in good condition, as my fiancee loves it, apparently. I actually had really bad dandruff starting a year ago that was driving me insane, and dandruff shampoos were making it worse, to the point where my scalp started hurting. Spoke with my doctor, and turns out that my body was set so that I really needed to shampoo 1-2 times every week, alternating (once one week, twice the next, once the following, etc).
THIS DOES NOT MEAN YOU STOP WASHING YOUR HAIR. People who use that as an excuse to stop washing your hair may just be lazy. A quick rinse while showering daily in between shampoo cycles will wash away dead scalp and dirt.
Sorry for the wall of text, this is just something that happened to me personally recently that I thought I could shed light on. People who think that shampooing less than at least once a day is disgusting are probably uneducated on the subject, or have no idea what using shampoo daily can do to some people's heads.
Again, DO NOT CHANGE YOUR HYGIENE DRASTICALLY BEFORE CONSULTING WITH A DOCTOR. The human body becomes accustomed to regular chemicals over time, so suddenly removing one from the mix can be dangerous.
Here's an article talking about this:
http://www.npr.org/templates/story/story.php?storyId=102062969
Edit: Wow, that was way longer than I expected. Basically, everybody's scalp is a unique snowflake that survives under different conditions. Someone who shampoos every 3 days could have horrid dirty hair and scalp. On the flip side, another person could shampoo every 4 days and have healthier hair/scalp/appearance then someone who does so daily.
Double Edit: Also, now that I've switched to the new cycle, my hair has no dandruff, and is not greasy at all. I also now feel like I may have ostracized myself on Giant Bomb due to revealing my required shampooing habits.
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