I had a friend once who started a company, but didn't want to be too successful because he didn't want to take money away from other people. His competitors, I assume.
Two answers to that:
First, if you're better than your competition, and people want to buy from you, why make them settle for an inferior product by sabotaging your own sales? That's crazy talk.
Second, the size of the pie is not fixed in stone. It's a growing pie. And the more people there are helping grow the pie, the faster the pie will grow. OpenSim vendors who think they are competing with one another: you're not. You're competing against other technologies. Each time a vendor brings a new customer to immersive technology, that's one more customer for the entire ecosystem. Someone who rents land from one vendor may also rent land from a second vendor for a different project, buy virtual goods from virtual world merchants, hire designers and developers.
This isn't a zero-sum game. And the faster the technology evolves, the faster services improve, the quicker we get to the tipping point where it starts to really take off.