Depends on your visa, standards and location. With non-o visa staying in your own house somewhere in Isaan minding your business from 500€/month to no limit with some posh elite visa living on Koh Phangan renting 100k/month ripoff villa and doing dubious amounts of kambo ceremonies and such.
Also what is the procedure if I decide go back to Finland for few months as there is no customers at the moment? Is it possible to apply for non-b over there using my current wp?