Yes, but so what if I have a "billion dollar" idea? An idea is merely a thought inside the mind. Just because an idea can be used to make money shouldn't give me (or anyone else) the right to own it. If you don't want others having access to your idea, then keep it to yourself. Thomas Jefferson put it far better than I ever could:
If nature has made any one thing less susceptible than
all others of exclusive property, it is the action of
the thinking power called an idea, which an individual
may exclusively possess as long as he keeps it to
himself; but the moment it is divulged, it forces itself
into the possession of every one, and the receiver cannot
dispossess himself of it.
That ideas should freely spread from one to another over
the globe, for the moral and mutual instruction of man,
and improvement of his condition, seems to have been
peculiarly and benevolently designed by nature, when she
made them, like fire, expansible over all space, without
lessening their density in any point, and like the air in
which we breathe, move, and have our physical being,
incapable of confinement or exclusive appropriation.
Inventions then cannot, in nature, be a subject of property.
I like to think of it like this: At some point in the past, two ancient humans were sitting in the rain. One of them -- let's call him CavemanA -- was smart enough to construct a shelter. That certainly would have been a unique and valuable idea at the time. But do you really think that CavemanA should then have the power to tell CavemanB that he's not allowed to build a shelter?
Ideas are not property. Allowing people to own them is extremely harmful, and should only be done to prevent even more harmful situations from arising. We certainly shouldn't give someone ownership of an idea for no other reason than to reward them for having it first.