There won't be any limits on the supply. Check the first page. For every minute passed, there will be new 60 grins to be minted.
Quote
- Block Time: 1 minute - Block Reward: 60 GRIN
Thats some fast cash being printed right there !
Much less than the fiats being printed and I think that is the angle this coin is trying to replace, fiat cash. If you want to be a long term speculator you're probably best suited at investing in Bitcoin over grin.