1900 baht per visit to the immigration office, followed by a 3000 baht boarder bounce repeated 4 times throughout the year including the in between boarder bounce where you have to leave Thailand for 3 days to apply for a tourist visa via the Thai consulate (well over 3000+ baht.)
That’s just for one year without factoring in time and additional costs.
So yes, as I said above, 20,000 baht for 8 years is much cheaper than paying for extensions and border bounces etc. Plus, you are saving a lot of time.