I think your information is incorrect. Can you provide more information of these 1k usd work permits?Some service providers can get you a work permit for 1K usd a year.
Or a student visa for 600 usd a year.
Cheapest Business visa + work permit i can find is around around $4295/ year + They have to report around 80k THB ($2375) salary / month for you. So top of the "package price" you will be liable to pay around 100k THB ($3000) thai income taxes (before any reductions) + if you are from and still have tax residency from non-taxfriendly country, maybe you need to pay some income tax to your that country too, depending on DTT.