Eye, for me there are people who just want the basics and to spare, and other crazy as we want to customize everything!

We also think that these RESTRICTIONS are those that generate more value that does not have Simply see that hotmail had only 2 MB! and appeared with 2 GB gmail!, or MS people reserve infrastructure and people to google her! (Not to mention the strip in your head), and that people liked it and I think it's the trend.

I think that on one hand these large sites generate a certain manners in people, and to restrict or change certain functions, complain but do not stop using their products because they are "part" of our lives.
On the other hand, in a certain point is understandable point homogeneous seeking these companies, which generate constraints and non Customization providing: support all of this has an operating cost that resulted in the scale of users who handle the same power and does not become viable, so they seek to minimize the impact on their platforms.

crystian and Emiliano, thank you for comment
Also I still think that "trick" is that many times people (or "thick" people) prefer alternatives such bounded instead of customization possibility that if anything frightens them more than attracts them.
Otherwise, see the historic competition between Windows and Lunux, in which we all know that Linux is better, faster, more efficient, etc ... however, an average user does not know how to use a command line! (And rightly so it is ).
You can also see the example on blogs, which are, in fact, a form of "restricted" an ordinary website ...

Sometimes, simply do not need the customization, so would I change colors eg facebook? ... Is not the end. For me complicate. In fact if I did not use it, not saying that other users would use neither ... there is always something for everyone users. In the case of twitter, but a limitation is already a concept, but they would not want qe I think. I think what has to be clear is the service or purpose of what we provide to your site, web, system or whatever, and make life easier for that user, not necessarily do everything that involves custom.
I do not want to tear down your wont, I feel good and share opinions reflection of this issue is key to tackling a project. Greetings.

Hello Rengo, of course, what I was trying to say is that maybe the key is that the "limitation" is the concept!.
Twitter as you say (which at this point is a beast how many users you have, the popularity and generate traffic, plus all the peripheral applications) created the concept of "micro-blogging", which is ultimately a restriction a blog, and this was his success.
Perhaps they can provide a service "cut" and is more powerful than the FULL version ...