Gamestop’s investors aren’t liking the new anti-used game rumor that sprouted today.

The massive retailer makes a lot of profit from used game sales, and it’s something that also sustains the company. Their stock has gone down by over 10% at the time of writing this article and it’s something that should really worry them.

Check out the screengrab below which shows the significant drop. You can check it out yourself on Google or Yahoo Finance.

Sony had earlier patented anti-used game tech as well, and will most likely follow Microsoft, because of pressure from third-party publishers. After all, they can’t risk the new Xbox getting a lot of benefits like timed exclusives due to this move.

The stock plunge shows that the investors clearly believe used games business is the backbone of Gamestop, and such a rumour causing a massive fluctuation in stock value is definitely something to take note of.

Update: down 11% now.