The reason is because the cartel needs to gradually consume the hashrate of the network, so it can delay the transactions of non-cartel customers who are on the blockchain. To force them to join the cartel or lose customers to the cartel.
Yes, much hand waving. Again, just because you can say it, does not make it so. There is zero evidence that a cartel of any size less than 51% of the total network can delay fee paying transactions issued by others to any noticible extent.
Your ignorance of Satoshi's white paper and Bitcoin 101 stands out like a blackeye.
The cartel's percentage of the hashrate controls the percentage of blocks won, which therefor controls the percentage blocks that the cartel can exclude non-cartel transactions.While the percentage of total hashrate controls the percentage of blocks that said cartel can control, they can't control the others in any fashion. Control of blocks is not akin to control of transaction processing, nor is it akin to delaying of transaction processing.
You are displaying your ignorance of the proof-of-work technology.
This is wonderful. You are destroying your reputation all by yourself.
You better go research, because what I wrote (above in bold text) is 100% correct.
(variance will mean it is not a level percentage but will vary greater and lower, but that is irrelevant)
You think it out, or go ask JoelKatz or any knowledgeable Bitcoin developer.