The average wage in Thailand is low and contributes to the reason why it's cheap to visit or live in Thailand. If they paid a decent wage prices would have to rise but at the moment they are rising anyway from exploitation and greed.
I have seen many products in 7/11 that are as expensive as my own Country, Ireland , which is the second most expensive country in the EU.yes, import taxes , which are ludicrous, do account for this, wine being the best example, but sheer profiteering is rife.