The problem with all good staking coins (and 8% is still relatively good) is that people are not smart enough to use staking wallets to earn coins. The level of computer skills of the general public is very poor, and cryptocurrency enthusiasts are a little better but often not much.
I have published over 8 books with ISBN #s on Amazon and other sites and I'm writing a book on staking wallets and coins. I have supported Inflation coin for about a year now and need to work other things besides crypto to get by. If you want to help me to focus on the book, here is my inflation coin wallet address: iPjLoiJSahjRkQA4JJMAdZGmvoGtptFNiE
Most of the book is finished so if I don't have to focus on other work I can get it published soon.
I disagree as the retention rate has proven to be very high and the usage method is also relatively simple, in more complex setups that may hold to be the case but it's shown to have found it's niche.