Pretty shitty way actially.
Three 15 keys in time raise your rating only to something like 500 rio.
Any noob who does only +7 keys will have more of it (all +7 completion results in 700 rating).
You need to buy far more
different +15 keys in time to achieve considerable raiting (so you need to throw more $$$), and this still not help to get invites since raider io addon shows not only raitng, but also a number of completions each tier intime, and if its low and rating is high - boom, we have an obvious buyer here!
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Pretend that you're a log parser and try to detect ragequitter in this situations:
https://www.mmo-champion.com/threads...1#post52379200
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We have small team that try to push our own keys further, but leave if not in time or trying some tactics that fails.
So how you will detect "leavers" here?
Any way of tracking leavers will result in heavy abusing of this system.