1) Informational copies aren't infinite, they take server space, electricity, and maintenance.
2) and more importantly, how do you overcome the hurdle that production itself requires resource consumption? Stuff at the lower level of Maslow's hierarchy: Food, Shelter?
Producing quality content requires investment. How is a producer of that content to get a return on that investment if people don't pay for the product after it is produced?
I agree that we should all produce and share, but not all sharers produce. Just because you have the bits on your hard drive does not mean the product those bits define are yours to share. Those bits are not simply bits, they are the definition of something that creates value. It takes risk to create the order of ones and zeros and if that risk is not rewarded, then the risk/reward ratio becomes too high and there is no incentive to take the risk to create the product.
I know that many people create for the love of the game, but those creators have to make money somehow. They have to have day jobs or something that distracts them from the many hours it takes to create quality content. If they could get paid for the content after it is produced, then they could spend more time creating more quality content for us to consume.
There was a quote from Ayn Rand about money where she describes money as a battery that stores labor so we can benefit from that labor over a longer time than it takes to perform the labor. Well, those bits are just like that. Bits are a battery that stores the labor required to create the order of bits. Content production is the opposite of entropy and to defeat entropy, we must take energy from outside the system. The artist in this metaphor is the closed system -- the artist's brain is the system that creates the content. The consumer is outside that system and must put energy into it in the form of food so that artist can use that energy to create order from a disordered set of random bits.
Money is that energy required to oppose entropy. Without a transfer of energy, there is no way to create order. Without order, there is no content. It's just white noise and consumers don't want that...
If consumers don't pay for the content, where will the energy to produce it come from?