Prices in Australia, seem to hover around 1hr for about 1 days normal labor, The spread of prices matches the income on the clients.
Minimum wage $15 per hour -> $125 per days work and that is the minimum hourly charge.
Then there are >$1500 per hr escorts for the >$200 per hour high earners.
From what I have seen this ratio seems to hold true in many western countries.

In Thailand it seems to start at a middle class Thai days income for ST, though it's a bit of a skewed  due to the farang surcharge.
It seems to hold true in Indonesia when comparing local rates to local income, where a local will pay a little less than a days wages for ST, the sky is the limit there just like the spread of incomes.

With a passing interest in economics I have often wondered if this ratio is what the market can support or is it set on the supply side as in the minimum price of sustainable participation of willing providers. To add weight to favor the supply side in setting the price is the fact. in the higher end agencies and establishments there is a correlation between the WG's socio economic background and her hourly rate.

How does $300HK compare in HK wages?

[ Last edited by  HenryMiller at 27-1-2011 08:44 ]

The average wage for a single person is a bit more than HK$10,000
per month, or HK$400 a day (about $20K for a household).

So your rule of thumb finds further application, as a decent walkup
will charge HK$300+ for 45 minutes.

Most HGs charge twice that or a bit more and may appeal to
clientele with a higher income.

So 1 hr = A day's wage for the girl or a day's wage for the punter?  
Yep, it's all about supply and demand.