Thank You for posting the above, Skuzzy!
I use USB CH Fighter Stick, USB CH Pro Throttle and CH Gameport Rudder Pedals with a gameport to USB adaptor................ and I have never used a USB Hub or Powered USB Hub, and I have yet to have a single problem plugging my USB CH Controllers into any system since Win98se USB through Windows 8.1 PRO ( Although most all my machines currently boot up to Win 7 Ult 64 bit )
I do not dispel that using a USB Power Hub will not be beneficial, like Skuzzy posted "Why? Because it will not work reliably without it, for most computers."
I have always figured that certain Motherboards ( Higher End MB's) & PSU's have better components than the rest, is the reason I have never had the need to use a powered USB hub
TC
It is not about the quality of the components. Virtually all the USB controllers on the market are not capable of supplying the maximum allowed current over the USB bus. It is by design. It keeps the yeilds higher during manufacturing.
In a modern computer there are multiple USB hubs, but you have no idea which ports go to which hub. If you can manage to plug the CH gear into different USB hubs, which are not occupied with other USB devices, then there is a fair chance you will not have any problems as each USB hub can will be able to supply its maximum current to each device and not share the current with other devices.
If you manage to plug the CH gear into only one of the USB hubs of the computer, then it will be unstable. The total amount of power the complete set of CH gear draws is higher than the USB 2.0 maximum power specification. USB 3.0 has a higher power limit, but it depends on who made the USB controller as to what the real limit is.
You can play "mix-n-match" with the various USB ports to see if you can find the right combination to make it all work.
I wish motherboard manufacturers would mark the USB ports with the hub number as well.