Paying exchanges for listing make sense only for scam coins when it's not profitable for exchange to have such coin listed and it's associated with high risk. Hive never paid and is listed on Bittrex, Binance, Bithumb, MXC among many others. And yes, it's all about business after all, people pay fees for every transaction made there I see no reason to pay additionally to someone who are getting opportunity to make money. If anything it should be the other way around.