The support received through Bit donation allows streamers to upload more up-to-date and higher-quality content. This is the official center for the surveying the streamers and the viewers. But not all people get a reward from these surveys, only quick the people. That said, it is simple enough to calculate how much money bits cost in USD, and how much USD the streamers receive for bits. The Satoshi is currently the smallest unit of Bitcoin available. All other units are still available, so there are tons of Bitcoin conversion pairs to choose from.