The best reason to consider buying Roblox (NYSE: RBLX) stock before its second-quarter earnings report on July 30 is the rapid growth in its higher monetizing over-18 cohort. Winning over older users to the gaming platform is key to management's long-term strategy to capture 10% of the global gaming content market. It's impossible to predict how the stock will perform after the earnings report, but from a long-term perspective, it seems an attractive buy. Should you buy stock in Roblox right now? Before you buy stock in Roblox, consider this:The Motley Fool Stock Advisor analyst team just identified what they believe are the 10 best stocks for investors to buy now… and Roblox wasn't one of them.