I have been "on the line" now for over a year, and my per diem contributions have averaged +1000 usd (that's a mix of won and usd)
I easily save 4000 usd a year off the per deim (which in my accounting pays my loss of income policy)
If you just eat at the hotels, as AVR said, maybe a few big nights in Korea, you will break even.
Personal choices, I guess