In my opinion, while comparing prices in Thailand to prices in other locales might be interesting, it is also meaningless in terms of Thailand. The only thing that counts in Thailand is the way things work in Thailand. Maybe in the rarest cases there are boys asking for thousands of baht, but it is not by any means the norm.
From where I sit, a boy asking 6000 baht is WAY out of line. If a boy ever asks that of me, before I respond he'll have to wait a bit while I finish having my little laugh. Not going to happen. Those kinds of asking prices are unprecedented in Thailand, and I, for one, am not about to let such a precedent be set, especially since there are multitudes of boys perfectly willing and happy to go with normal prices.
"A shlemiel is the guy who spills his coffee. A schlemazl is the guy he spills it on."
- Jack Gilford (Bernie Bernstein), 'All in the Family'