£20 an hour for a hard court?, that's a lot, I could get an indoor court on a winter evening for less than that (local one is £17.20 p/h, which seems very steep to me but demand is high, if I had a lot of money I would build an indoor tennis centre, it would be profitable)
Are clay courts cheaper there?, btw why do you have use a Czech flag if you live in Brazil?.
I´m using the czech flag because I represent Czech in a MTF Tipping game (plenty of brazilians already).
But basically the courts to rent around here are expensive because I´m in a big city (Sao Paulo) where everything is very expensive. Actually the court is something like R$60 which is a bit less than 30 $.
There are public courts around here but they are a bit far from where I live, and in Brazil, they are not common, so it tells how shitty is Brazil´s tennis and why courts are expensive to rent.
I used to pay a similar month fee (something between 20 and 30 pounds) to a recreational club (with pools, and every kind of sports courts) that have 13 clay courts to play in the city I used to live, and I don´t know about clay courts to rent but I think the price is the same.
Off course you probably can find something cheaper, like the industry society club I used to pay only 10 pounds per month with 2 clay courts and one hard court court, but you must trust they are near to where you live.
I´m saying that for normal courts, for grass courts I think this price is not thaat expensive, but offcourse it would be a luxury.