Hello!
Yes, we issue a lot of tokens, but they are extremely cheap!)))
One hundred million tokens costs only 1 ETH at the start of the token sale.
Such large numbers are due to the low cost of notarization and high price of ETH. Since the tokens are always integer (there is no a half of token), you need to release a huge amount of tokens to provide transactions for a cheap service.
For example, for an common user the cost of the notarization will be $ 0.2. Then, at the cost of ETN= $ 300, the smart contract will take 667 SNTR tokens (detailed calc. in WP). So 3 digits will be enough for accurate accounting.
Thank you for interesting question!