I don't know how long game rounds last, but if you tell me that you have 60s only locked in that state, that means that the playable game round last around 2 minutes.
And anyway, that you will spend on average 1/3 of your time not playing when you came to play.
Numbers look strange, as 2 minutes looks very low to me for a party, but I don't know how you can explain the ratio of 50/150 otherwise?
And just as an aside, the article in itself tells you that they capitalize on you being in the buying phase to reduce server costs. So looks like that even if they could do something on the game play side to improve that, there would be financial incentives not to do so.