That's for a single brick, mind you. Not a set. Just a single 4x2 brick.
That brick is made from 14-carat gold, though, and between 1979-81 was given out to employees who had worked at the LEGO company for 25 years.
So it's not only made out of gold, it's incredibly rare too, and is bordering on being an antique.
No wonder it's priced at $14,450. Still, if this makes any difference, it's to scale, so it'll work with normal bricks.
14k Solid Gold LEGO Employee Brick 2x4 Brick in Display Box [Brick Envy, via TAXI]