This is not the only coin that people mine it's the story of every coin. Look at the supply chart one year will generate 7-9b coins? What do you think will happen when all these new coins comes in market? I know company will progress right?
I think you are still confusing what "the company" and "the network" are. Siacoins are the instrument for paying storage contracts on the Sia network. And Siacoin is a
mined coin, what means that you are not buying the new coins to Nebulous ("the company" of the devs), but to a miner. The inflation of the coin is the mechanism to provide miners an incentive to keep securing the blockchain. In other words, Nebulous Inc does not take any benefit from the inflation. Moreover, Sia was not a premined coin by the devs.
The instrument that incentivizes the developers to keep working on Sia are the SiaFunds, the second asset of the network, that pays their holders a proportional part of the 3.9% of fees on every file contract formed on the network. Thus, developers get profit only if the cloud storage network of Sia gains massive adoption. And if that happens, the value of Sia will rise too, in order to accommodate all the demand of Sia storage, that can be paid only with Siacoins. So as you see, the interests of developers ("the company") and investors are aligned.
Very good explanation. I was never interested in mining, maybe you can enlighten me, in case I have Siacoins is it possible to do POS mining? Or it is only POW? I will appreciate if you could provide me with some links for "beginners" as I'm totally zero in this. Thanks