A Colorado business owner admits he may have underestimated the power of Colin Kaepernick now that his store is going out of business.

COLORADO SPRINGS, Colo. (WTHR) — A Colorado business owner admits he may have underestimated the power of Colin Kaepernick now that his store is going out of business.

Prime Time Sports in Colorado Springs is closing its doors. Owner Stephen Martin told KOAA his decision to rid his store of Nike products after the company's ad campaign featuring Kaepernick was a big hit to his business.

"Being a sports store without Nike is kind of like being a milk store without milk or a gas station without gas," he said. "How do you do it? They have a monopoly on jerseys."

After Nike released the Kaepernick campaign last year, Martin sold Nike apparel at half-off to get all of it off of his hands.

Monday, the store once again was lined with sale signs as it's going out of business.

Martin says his store is the only licensed fan shop in more than 400 miles from Castle Rock, Colorado. He has apparel for all NFL teams in his store, but he doesn't carry jerseys because of their Nike affiliation.

Martin also canceled a 2016 autograph session with Broncos Brandon Marshall after he kneeled during the anthem.

"As much as I hate to admit this, perhaps there are more Brandon Marshall and Colin Kaepernick supporters out there than I realized," Martin said.

Martin said his store has seen a 15 percent decline in sales in the last three years.

The store will stay open until all items are gone, but Martin said he has his dignity and he's able to live with his decision because he did it his way.