I'm confused. They're doing just what you're saying --- they're not getting in the ring. That's exactly what you're QQing about. So what's your problem?
Ranked is a place for 8 man premades to run against each other. You enter the queue, fight whichever team is in there, then get your rewards. That's "Getting in the RIng."
What they're doing is more akin to the neighborhood kids hijacking your state's official baseball field for a pick up game of catch.
Now to tone is down a notch (cause ranked isn't major league baseball), I think it's fine for people to use the "field" if they can't find a legit opponent and want to get some matches in, but if a legit team is in there waiting for opponents, it's pretty crappy to dodge them (exploiting the system).