Brand, student services (like career management services) and opportunities available at universities (like trading or case competitions) are things that you cannot get out of self-study. Moreover, the constraints imposed by a course channel your efforts so that within a given amount of time, you will have completed a course. Universities also provide the opportunity to bond face-to-face with people going through the same tribulations as you, which provides comfort to the human in you. Lastly, having access to a person who is paid to help you understand difficult concepts can save you *a lot* of time.
The hardest part of self-study without the constraints provided by a syllabus is the very likely possibility of a "diffusion" of your efforts. As you begin to study one thing, then check a reference and begin reading that and find a reference there which you begin to read, and... eventually, the months go by without you having learned (in depth) the first thing you began reading.
I find that self-study allows for the acquisition of a large amount of shallow knowledge while university classes allow for the acquisition of a limited quantity of deep knowledge.
However, these are my experiences and you may find it is different in your case. I suggest you try learning discrete-time models. Shreve vol I (
http://www.amazon.com/Stochastic-Calculus-Models-Finance-Hardcover/dp/B008CM6PDY) is particularly readable, "short", and related to what you endeavour to do. Maybe you'll find that you are more capable of focused self-study than I am.