[lionpixel]

In the press conference after the Falcon Heavy start a journalist asked the question of how much the investment was. Elon answered “around half a billion [silent for 1s] propably more.”

[kore]

Correct, but that was just the cost to develop the core booster of the Falcon Heavy.

That doesn't include the original costs to develop the Falcon 9 and all of its subsequent variants, nor the cost to develop the original Falcon 1.