Just testing the waters is all. Looked into dedicated mining systems but looking for something where return in investment is worth the investment.
ROI is never sure, because of so many factors (Electricity costs, no power, no internet, breakdown etc.). Maybe you could try to start small. I only have 1 Rpi running with a D-link hub, which has a fan, an asic blocker erupter, and an antminer U2. They do about 2,3 ghash but only use a few watt of power (5 maybe). But this is surely not profitable, but only hobby.