That was before the $4,000 price drop.I'm not sure how much they are "getting away with it". To wit:
"My regular rental houses have had to sell most of their C300 II stock, because not many people are renting them. In their words, the C300 II is a flop (in the UK).
“They’ve all had to buy a lot more Sony FS7 stock, because the demand is very high. It’s also hard to get an FS7 at short notice.
“The glaring omission from the C300 II is 4k60p and a rubbish 120fps mode. That’s the reason why the cheaper FS7 is favoured. Canon really screwed up on that one."
http://www.eoshd.com/2016/08/canon-c300-mark-ii-flopping-vs-the-sony-fs7-at-rental/
C300MKII obviously has the dual pixel auto focus that works very well with the most prominent Canon glass.
And many prefer the warm Canon look.