Long overstay

i am thinking of overstaying my visa for 75 days on purpose. i know this is likely a dumb idea but it will save me quite a bit of money on visa runs. where do i pay the 5000nt fine for this and what would be a good reason to tell them why i overstayed for this long? Will i get in trouble or just have to leave the country? has anyone else ever done this? i dont care about getting a stamp on my passport saying i cant come back for a year because i will be leaving for good in 75 days. please dont respond if you are just gonna tell me i am stupid, and how much you hate overstayers. and yes i did a search but couldnt find anyone who said what happened for an overstay of like 60 days or more.