The reason that most people go for SCWCD after SCJP might be because most people today are interested in web application development (after all its a JavaEE exam). But its just a matter of personal choice. Someone can go for SCDJWS or SCBCD. I'm not sure if a certification can get you a raise in salary, but it can increase your chances of a good job (but there's no guarantee). It might give you an edge over a candidate with the same level of experience as you. A certification proves that you have handsome knowledge of a topic. And a certification is not just a piece of paper. When you prepare for a certification, you definitely learn ten thousand things. So it makes you a better programmer.
Whether you do MBA or SCMAD is your personal choice. I cannot comment on that.
Never thought life could get so serious
You never think about that, but it does get serious at some point of time, but the fun never ends. You'll have different kinds of challenges in life now that's all