Contango is normal for products with storage and financing costs, such as gold and index futures. For a long holder who rolls each month, contango is a steady drag: you sell the cheaper front month and buy the pricier next month.
This roll cost is why long-only commodity and volatility ETFs can lose money over time even when the spot price is flat.
Example: front-month crude at $80, next month at $81. A trader holding long through the roll pays about 1.25% per month in roll cost if the curve stays the same.
Related: backwardation, roll, front-month, etf