The only penalty is using up your flash's write cycles; but of course, this works to Apple's favor because it means you'll need to replace this thing sooner when the flash dies. Best part? You can't easily replace the flash because it's soldered to the board.... and the amount of people that could do this repair properly is close to non-existent.
Eventually...maybe...considering the sectors get flagged and there's spare sectors to be rolled into service...and odds are the battery is the real bottleneck before the Flash becomes an issue.
