Yep exactly. Though they are "cheap Chinese PSU", they are around 4 times cheaper than the equivalent wattage PSU, and have more cables suited for mining use.
Though cheap isn't always best in power supply situations! The best idea if you want cheap is to use commercial server psus and breakout boards, cos they're designed for the job and cheap as chips. They are noisy tho...
Speaking of PSUs, 2kw psu to run 8x Vega 7s per rig will be nice. There's the superflower 2000w platinum, which exists but I have no idea where to get it, and the 2200w evga platinum. No news from Evga since Jan 2018.