Well it really depends on how you want to "earn". Currently there is only a very small network, but there are a few ways to earn.

A) Become a Crownholder.
Each TR (Treasury Right) you get from a Crown will give you an option to sink the amount of VIVA that the TR can mint into your VIP (VIVA Investment Pool, think savings account). You can use this strategy to build a residual income with compounding interest. You can then go into "Retirement" mode (Think Powering Down) when you are ready, and get 24 VIVA/day until your VIP runs out or you stop it. At the current rate of VIVA:USD ($5.50), that's approximately $45k per year.

B) Market Making.
You can exchange various cryptocurrencies and fiats on TradeQwik right now. I believe there are still bonuses for market makers, but will have to verify that for you.

C) In the near future, running a node of several different flavors. There will be several types of nodes in the VIVAconamy, all responsible for different things. You will be paid in VIVA for your contributions to the network, and of course the chance of getting that Crown once per week!

I highly encourage you to keep up with this project. Even if you don't invest, there are plenty of ways to get in on the action, and become a "Vivo" :)