The last time I had a hotel holiday in Phuket was in 2009, they charged 250bht for a beer and 350bht for a glass of red wine....
And you're worried about a 300bht levy that lasts the length of a holiday in 2024...π
Actually, if you leave the day before the visa expires then re-enter, you get another 90 days, so near 15 months from it.
Get a 60 day extension, you now have near 17 months, I have done it many times...π