Invest a lot of time or effort to do the things that will receive the return back to the small number of. The benefits were not worth the investment to work with extremely large samples. Than necessary.
The contributions of time or a lot. To do what To get the rewards back a small amount. The benefits are not worth the investment. Large work Redundantly
A lot of effort or investment time to do things that will yield returns a small number. The benefit was not worth investing, working head than necessary.