I have visited the main island before as well, but honestly a big reason to why it is like that is because they are somewhat hostile to tourism. Yes it is small and obviously you can't expect a booming service industry but I think you could expect something at least.

If you read on their website it appears like they want visitors but yet seems to do a lot in order not to receive them. If they were more open to tourists they could probably afford more or bigger boats or simply more trips. It's not an unsolvable problem.

We just wanted to pass the islands and see it but it wasn't really feasible due to the restrictions placed. I wonder if it really has the intended effect.