not really - any branch can do the paperwork. My Bangkok Bank account is in Pattaya and I went to Bangkok Bank in Udon Thani for the documentation for immi for my extension. Of course no problem
seems you skipped some words during your reading - wealthy was mentioned in the original post and wealthy is mentioned in the description of the LTR included in another reply
I do my tm30 every time for my wife - have done that for years. It's not only for hotel or property owners - although it said that as far as I remember - when I registered