hmm didnt think of coinage before

however i'm not entirely agreeing with your 3250%
using coinage seems to only guarantee a 350% annual interest (if it were to only stake once per year)
although obviously staking more often would result in a higher effective compounded return. whether or not this resulted in 3250% would rely on whether the nodes would mint daily (or more). -- which is entirely possible

Any node is staking several times per day (you can check this by staking on your own), so even my daily staking assumption is conservative.