And for all you people who think installers clog up the registry, go download a registry cleaning program.
Which won't solve the problem. Do research.
Installers also FORCE the user to agree to the terms and conditions(a.k.a EULA)of the game by clicking the little "I Agree" radio box. That means that IF they happen to defiy(spelling?)the agreement(stealing reasources, ilegal redistributing, etc), you can sue them.
It's nice to know we have experienced professional lawyers on the forum. Do research.
They also let you create a Start Menu folder for the game
A user can do that, (as can a game) and I have a start menu that no longer fits on my screen. Not always desirable; do some research.
Those are some of the reasons commercial games use installers.
Actually, it's more that they want to stop emails from noobs going "HOW I MINE FOR WINZIP".
Now, lets talk about ZIP/RAR files. Zip/Rar files(note: I will be refering to zip/rar files as zip through the rest of this explanation)are good for certain games, but NOT commercial games/profesional games.
Where are you getting this data from? Do research.
They make it harder for all the n00bs who dont know how to use a computer(I however, am not one of them).
How did they get to a site about Game Maker then? And if you're distributing online, you can easily package a manual with it.
They wont know where how to create a shortcut, they wont know how to extract it, they probably wont even know where they put the file/files!
Good for them, maybe they should have read the basic instructions given to them in the readme or the website.
Zip file extractors usualy have a horrid GUI compared to some installers.
Usually? Weasel words, citation needed.
So, for all you people that say "everytime I download a game with an installer, I delete it" that obviously means that you dont play games commercial games.
Actually, most commercial games are distributed either via a DRM platform (e.g. Steam) or via physical media (CD-ROM). Steam does the setup in the first case, and in the second case it's not being downloaded. I think you'll find that they're also referring to games from the GMC, meaning the target audience are computer literate and that the people downloading will probably mass-download games.
If you think that commercial games should have not have an installer, then heres my awnser: STOP FLOODING THE FORUMS WITH ALL THIS "I HATE INSTALLERS! I THINK THAT ALL COMMERCIAL?NON COMMERCIAL GAMES SHOULD USE ZIPS" S***!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
ZOMG!!!!!! EXCLAMATION MARK OVERUSE!!!!!!!!!!!!!!!!!!!!!!1111 STOP FLOODING THE FORUMS IN ALL CAPS

Here's my answer: Why are you touting the benefits of installers when most people want a zip? You should either go with what your customers want, which is a .zip file, or give a choice between that and your installer.