Hi, yes it seems high if it's just the TT3 and not the full WP. It's correct that the TT3 expires within a month and then the whole process needs to be started again, which is basically ALL the work.
Yup... been doing non B for 12-13 years...but never been easy... just easier 😃...cant comment on non O...investment visa had lower requirement b4...after financial crisis...which makes sense...i guess the Thais all go," I remember when it was 25 baht to the GBP" etc b4 the crash lol