Now we are back to market forces, supply and demand issues, nothing more.
Young guy = less baht, cheap charlie shirt confirms it, offer is 3 weeks work Vs perhaps no work at all during low season (implied 3 weeks contact to charm more baht out of him).
As a business decision, sure, some TG/BG will go for it - the money you can afford and your willingness to accept the lowest bidder are the key points - "good looking" counts for nought in that scenario.