Roblox has no trouble attracting players, but profitability is another story. With steep losses and a premium valuation, investors need to watch these three levers closely.Roblox (RBLX -7.95%) has no trouble attracting users. More than 100 million people log in daily to play games, socialize, and build their own experiences. That kind of engagement is rare in digital media -- and it's why many investors see Roblox as a long-term growth story.But engagement hasn't translated into profitability. The company c ...