We won’t be able to blame the heat Thursday night.

We probably will have to blame the product.

Get prepared for more swaths of empty seats for the Rams and 49ers. As of Wednesday morning, there were thousands of tickets available for sale, some for as low as $14.

That’s about the cost of a premium beer at Levi’s. Those $14 resale tickets are in sections of the stadium originally priced at $85 a ticket, plus, a $2,000 Stadium Builders License, bringing the total cost to almost $200 a ticket. Now selling for $14.

That’s the low end. But tickets are available all over the stadium for far less than their original value.

As you might suspect, this is irritating the “faithful” customers, who ponied up at the original price and now find themselves paying far above market value and unable to recoup their investment because of the glut of available tickets on the market.

I’ve heard plenty from the faithful upset about other things: club areas opened to non-club members seeking relief from the heat, meaning the amenity the club owners paid for is no longer as valuable because the space is overcrowded. Not having the same people in the neighboring seats, so no community vibe, the way there was at Candlestick Park.

Last year, 2,627 seat-license holders defaulted on their SBLs. The Santa Clara Stadium Authority financial report of June 30 noted that 1,653 owners defaulted the last quarter. Payments are due March 1 and new SBLs are financed at an 8.5 percent annual interest rate. The SBLs are designed to service the stadium debt.

The 49ers’ franchise isn’t hurting. This week, Forbes ranked it fifth in the league in valuation at $3.05 billion. But the cracks might be showing. Last year, Forbes ranked the team fourth. It dropped a spot and its increase in valuation was tied for second smallest in the league (2 percent).

Forbes noted the seat-license issue: “Fans aren’t happy and some have dumped their Stadium Builders Licenses on the secondary market and recouped less than half their cost.”

In the case of Thursday night’s game, way less. You can get into the game for the cost of a premium beer.

Ann Killion is a San Francisco Chronicle columnist. Email: akillion@sfchronicle.com Twitter: @annkillion