... said Ron, "You know we're not supposed to do spells outside school-"
"Bit rich coming from you," said Harry, staring at the floating car.
"Oh, this doesn't count," said Ron."We are only borrowing this, it's dad's, we didn't enchant it. But doing magic in front of those Muggles you live ...
"I told you , I didn't -- ... " (said by Harry)
"Bit rich coming from you" looks like an incomplete sentence in spoken English. Is it like saying: it's a bit rich/expensive thing coming from you?