Blergh, PhD
The thought of doing a PhD couldn't be less appealing to me. Essentially, you will be
paid pittance to research something that
anyone else could spend
four years investigating. It's unlikely to be life changing. Furthermore, anyone else can use your knowledge in a practical sense after you have completed it.
The whole 'change the world' philosphy is a massive farce most of the time. When I studied biology I wanted to cure cancer. I then learned that if I took a PhD it would most likely be spending 4 years rearching one receptor on one protein out of a hundred that is produced in one stage of a life cycle of a fungus
that nobody cares about and has no use.
Do you really want to spend four years of you life doing that? Really? Really really
really?
Unless there are other factors influencing you and you are 100% sure it makes sense, avoid like the plague!