When we talk about profitability of investment, we are referring to the ability of a company to obtain a profit from the actions taken.
Therefore, calculating the profitability of an investment is key for any project, since it will allow you to know if the effort is being rewarded and you should maintain the measure or, on the contrary, it is not being profitable and, consequently, you should abandon it or, at least, reformulate it. Let's say this information answers the question “Is it worth it?”