People get what they want because it fits their needs, regardless that it might be too expensive for them or not. I guess what most people are getting at (in this thread) is about a certain part of a comment made here:
"Since we are going to talk about our feelings, I do feel like the 13" is a joke. It's a fine machine, but its just skimpy. I feel like those that "love" the 13" just can't afford"
Granted it's an individual's opinion, it can come out a crass to certain people. Maybe that person is talking about it on a power user side. But the people that are commenting probably don't need that much power, and it has nothing to do with the cost or affordability.
I work in the business field. I go to a lot of board room meetings, travel on planes a lot, especially long international flights, and use my computer for mostly MS office (word, ppt, excel)+Google Docs. I don't need the power or size of the 15" The form factor on the 15" is really quite large compared to the 13". Even if by an inch and 3/4ths the size percentage is that much larger. I generally fly business class and the rare first class, even then the 15" is daunting on a plane. Also, if you spend a lot of time in a cafe or similar places, with the smaller round tables, 15" is like monster compared to the 13"
An example would be TV screen sizes of a 42" tv vs 50". You are looking at a screen difference of about 41%. That is a lot of real estate for an added 8", barely a qtr of the 50" and you get an increase of almost 50% in screen size. Post #36 says it all, with the side by side image of the 15" v 13". Yeah it's only less than a 2" wide difference, but you can totally see how much more massive the 15" is, regardless of power.
The main point I'm trying to get at is, people get things for what they need, not because they are cheap, can't afford it, or even spend more than what they need. As mentioned earlier, the comment coming from a power hungry IT user could be directed an another IT/power user.