An idea by itself is worthless without execution, but definitely worth something with the right execution behind it. So you can think of an idea as a multilplier, where the better idea will give somebody skilled in execution a better output.
To explain:
stupid idea: x0,5
OK idea: x1
good idea: x5
great idea: x10
Now if someone good at execution starts a company with an OK idea he will make, let's say, $1.000.000. The idea is the multiplier, so if he executes a good idea he will make $5.000.000, and if he executes a great idea he will make $10.000.000.
So you can argue here that a great idea is worth $9.000.000 more than an OK idea. But you can also argue that if it doesn't get executed it is worth nothing.
That is the dilemma.