If you have the choice of taking a long term percentage payment, or don't think its going to work out and someones willing to give you some money up front so you take that instead to skirt the risk, that's okay. But when you see that long term investment blow up and realize you would have made your initial payment a million times over maybe more, to bad. I'm sure there's people who thought google stock was a risk and opted out, or any other scenario, when the company becomes the thing and the price soars, you don't get to whine and get all the money you would have made back. Woulda, shoulda, coulda. This Polish law sounds interesting, almost lets you turn back time and change your decision, sounds like a nasty precedent to set, what kind of world would that be where everyone sells their IP for cash and not choose the percentage, and then if it works out can sue for the money they would have made... This guy got his risk free money that didn't depend on success, I can only imagine he sold more books than he ever would have if he didn't let CDPR take his creation and turn it into something for the masses.