Bitcoin closed Monday at $9,691. The surge brought the cryptocurrency closer to yet another milestone of $10,000. This year, Bitcoin is up 900 percent. Business Insider's Frank Chaparro says investors see more milestones on the horizon. For the first time, the market for digital currencies cracked $300 billion Sunday night. Ethereum, the second biggest type of cryptocurrency, is now flirting with $500. Chaparro says the climb of cryptocurrencies will continue as more institutions get on board. But while Bitcoin hits milestones at an even quicker rate, it has some worried about volatility. Chaparro says most folks expect volatility to dampen as more investors jump on the cryptocurrency trend. One notable investor who is bullish on Bitcoin is Mark Cuban. Cuban told Business Insider people "...have no reason to sell it as long as demand continues."