I encountered these rental rates for boats in Pokhara, Nepal.
What I find interesting are the costs for a "driver", the Nepalese equivalent of a gondoliere. The difference between hiring a boat for one hour with and with no driver is 50 rupees.
However, if you rent the boat for two hours, the difference is 250 rupees, or 125/hour. If you'd take a boat for a whole day, the difference is 800 rupees, or 100/hour in an eight hour day.
The one hour rental rate has the cost of the driver at 14% of the rental price. The wage costs of the daily rental is 800 rupees, or impressive 53% of the rental price.
Is it worth it? You'll have to find out for yourself.