Rockstarr001:
BB did a great job but we wanted to add a second set of opinions:
1) Do these online courses actually add value and compensate (even slightly) for low/avg. academics?
Not really. They will reward you for effort but it will have a negligible impact on your overall decision.
2) If someone completes CFA and scores 750+ in GMAT, then do these online courses even matter?
See my response to your first question. Those online courses will not matter regardless of a CFA certification and your GMAT score.
3) What are the ways one can truly compensate (maybe even 50%) for academics? Or are we pretty much helpless and should rather focus on highlighting the good parts of our application?
GMAT, GMAT, GMAT (or GRE, GRE, GRE). That's your best shot to counterbalance a low GPA. If you have a compelling reason for a low GPA, you should explain that in the optional essay section for each application. I dislike the word "helpless" but you should maybe need to adjust your school list just in case.
In conclusion: don't waste your time or money on extra courses. Focus on the GMAT and the other components of your application.
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Admissionado