Binance did really well in the 2017 bull market but now there is a lot more competition and too many exchanges so it is not going to be easy going forward.
It did well this year as well if you were able to buy it at its lowest price and sell it at peak.
I set a period for this year, using this tool
https://coinmarketcap.com/currencies/binance-coin/It's lowest price this year was 6 usd and it's highest was 38 usd, and that's the fact that it really give good return if trading was done in the right timing.
Even at the current price of 15 usd, that's still more than 100% increase of 6 usd.