400 Million?! Maybe I'm missing something, but last time I checked, CoinMarketCap was just a stock ticker website for cryptocurrencies. Where is the value...?
You're underestimating the influence CMC has over the space.
They determine what exchange volume is legit and what isn't, also what coins are worthy of being listed. At the least, this gives Binance additional stability, at the most, they can really consolidate trading volume at their exchange and for Binance approved coins.
The coinmarketcap volume is not legit at all. They created the adjusted volume metric but it's still plain wrong. They currently show a 24h volume of $112Bn and a total market cap of $182Bn - that's just ridiculous.
That makes more sense, if the assumption is that institutional level investment is primed to get in and CMC's SIMETRI rating system is the seen as the most trusted way in.
Which I have serious doubts given how so many Banks and Hedge Funds already have established systems in place. Fidelity being the most notable in the US for example, but are much larger outside of the US.
They determine what exchange volume is legit and what isn't, also what coins are worthy of being listed. At the least, this gives Binance additional stability, at the most, they can really consolidate trading volume at their exchange and for Binance approved coins.