Your words.
3 things: 1. I don't think that the maturity that you glean from a given job is directly proportional to the amount of income you make or whether it is entry-level or not. 2. All of these positions began as entry-level jobs, and at that time, they were still supporting a family. 3. It is the act of having a job (whatever it may be),and fully supporting yourself, rather than being in school and functioning as a pseudo-adult, that would make you more mature and also help to add perspective about what the real cost/benefit relationship is with any career choice.
I'm kind of done with this conversation, but what you said and the way you said it (or at least the way that I read it) was a huge generalization, and I just wanted to point out that it comes off as narrow-minded and pretty condescending for all of the people that do support themselves on jobs of this nature. It is obvious at this point that this is not how you intended it to come off or that I misread it - either way let's stop beating this horse