Costco is a place for everyday consumers, but that doesn't make it the right stock for everyone.Costco (COST +0.06%) is the go-to place for everyday consumers looking to save money on a wide range of products and services, but does that make its stock a long-term buy for everyday investors?Although the stock has rallied by more than 150% over the past five years, it's only up by 5% over the past year. Those recent gains include a 13% year-to-date rally, so it's hard to make a decision just by looking at Cos ...