Linode apparently has 10k IOPS limits:
http://www.webhostingtalk.com/showthread.php?t=1391492

Does DigitalOcean have any IOPS limits per droplet? Automated or manual (abuse team)? Maybe different IOPS limits on different droplets?

There should be some rules about that, since it's a VPS provider. So would be good to know, when exactly a droplet would be blocked, on which IOPS value?

If REALLY droplet's IOPS would reach as high as 50k-60k (or even higher, like 90k), and would remain there constantly, what will happen then? (Fully legitimate use, nothing illegal, nothing bad, nothing forbidden, just a normal good website becoming steadily popular).

Thanks.