I think someone needs to learn the difference between 4 Rails and 4 Connectors. Before they melt down a shiny new miner and blame it on the manufacturer.
This is why these manufactures need to be providing power supplies. I've never gotten the point of not providing one. Other than to make it difficult to figure out what the hell you're doing.
They could have an option to sell a power supply as an addon item. However, unless it's a well tested and known brand (if not built in house), you can get fires and potential law suits as we've already seen from bitmaintech.
why is it difficult to look at a guide for the product to see the reccomended PSU wattage (Generally a 650W+ is recommended for an antminer S3+)? Its pretty common sense on how to wire up a few PCIe cables and understand that a GOLD/PLATINUM ATX supply with a single 12V rail and sufficient wattage is required.
It makes no sense to buy a PSU (lets say a $60 Corsair CS650M) thats located in china, pay to ship it to your country (~$25), pay import costs ($10), and quite possibly not even receive a compatible power cable for your country with it. So now a PSU that costs $60 locally is received days later for $95+ why does that make any sense?
if you dont want to set up a powersupply, buy a complete solution miner like the S4 or the SP31