Binance coin benefits from high volume. When bitcoin is in a bull run, or when it crashes very fast, there are Volume spikes. Many people use a lot of BNB to save on exchange fees.
And most people want to participate in the ieo , you can earn a lot of money , I think some of the funds still need to keep in the bnb , and try to participate in the ieo suddenly you're lucky in the lottery and you can make good money