What cable were you looking at that was $50?
The Wouxon one is $15.99:
https://www.buytwowayradios.com/wouxun-pco-001.html
My experience is that this cable is MUCH better than the typical Baofeng one, and I use it for all my radios that require that type of cable now. No driver games, and I have one radio that would transmit when you plugged in a cheap cable; no such issues with the Wouxun one.
Interestingly enough, on the KG-935G page it says that cable is $14.99.
But I think I know where the $50 came from. You were looking at the RT Systems cable and software, which IS $49.
RT Systems software requires that you use the corresponding RT Systems cable. The item on the BTWR site is a bundle with both cable and software. But the cable can be used with multiple different radios that use the Kenwood interface, so you buy the cable once and then just buy the software if you want to program other radios that use the same cable.
Their software packages are great. Often easier to use than the manufacturer's software (if there IS any) and Just Works. When you get right down to it, analog radio programming software looks like a spreadsheet with another page where you can set options on the radio. So there is nothing fancy about their software; it just works and isn't full of bugs.
But if the Wouxun software meets your needs, then no reason to buy the RT Systems bundle. I would still recommend paying the couple extra bucks to get their programming cable.