what u mean by return on investment? is pay after placement is good or bad option
Firstly, Placement varies college to college so it shall depend on the college you are asking for. Secondly, ROI in layman terms is the amount you spend on studying in total and later are you able to justify the expenses with the placement you get. So its the investment you put in MBA education and what value you get in back/return through the placements.
Hope this helps.