@juandfacundo a lot of the early hosts are using drives they have already purchased or just have lying around, which means that they can make money while still offering very low prices. As the network matures, and as the redundancy requirement is lowered, we will probably see the payout settle between $1 and $2 per month per TB for hosts. A 12-24 month ROI for hosts seems pretty reasonable - most drives last longer than that, which means that over the course of 3 years you should be able to make 50% returns, which is pretty significant compared to the growth of the stock market.
Time will tell. Sia is a competitive platform, which means the best/cheapest/strongest hosts will make money, and the rest will probably be out-competed. It's too early to know exactly where the optimal price will fall.