Thats wrong , the Reward Pool does stay the same no matter how many users are active or how many new users sign up. Just have a look at the steemit FAQ: https://steemit.com/faq.html#How_many_new_tokens_are_generated_by_the_blockchain The Inflation does start at 9.5% and does decrease by 0.01% every 250 000 Blocks (~0.5% per year)