Costco has officially added platinum bars to its lineup of precious metals, following the successful launch of gold and silver products. The new Swiss-made 1-ounce platinum bars, priced at $1,089, are exclusively available to members. This move comes as the company capitalizes on skyrocketing sales in gold, with reports indicating strong demand for its gold bars. As Costco continues to grow its offerings in the precious metals market, questions are being raised about whether investing in these platinum bars is a smart decision for customers.