The stock of Costco Wholesale (NASDAQ: COST) has had an incredible market-beating run over the past few decades. It's really a no-brainer buy, with all sorts of positive qualities, and it should have lots more room to grow. However, it's trading close to its highest valuation ever. Is now the worst time to buy?

Costco has a membership model that yields loyalty from shoppers who want to get the most bang for their buck. At $60 annually, it's a win-win for Costco and its members.

There are reviews all over the internet explaining how much members need to spend to make a membership worthwhile, and the bottom line is, members can save well more than the amount of the annual membership.

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Source Fool.com