@Bob *********
It is if you get caught.
Which can happen even if you aren't doing anything wrong; if cops get on a bus and start checking passports, or imm officers patrol airports and do spot checks one day.
Both have happened to me. I was not on overstay. If you're apprehended, you can get deported & blacklisted even with just a few days overstay.
Its just not worth the risk. Not if it can be avoided.