For ROI it is how much you make with your dollar spent/invested. For example on 33% ROI: Every dollar I spend I get $1.33 back... If I get less than a dollar back then it would be a negative ROI. I always try to aim for 50% ROI, I spend $5 on a computer tower, I hope to get at least $10 back. From that $10 I need to subtract $5 investment, labor (~.25-.30c per minute), energy (gas/electricity; usually negligable), and any other cost associated with getting that return to see if its worth my time.
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