They can stay until the next day in camping stores, they charge for the entrance with the vehicles or not

Yes they charge to enter and you can also stay to camp

Yes, you can camp overnight and they do charge $10 per vehicle, regardless of the number of people in the vehicle.

Friend I have gone and if you pay at the entrance but I have stayed until 11 o'clock and nothing has happened

You can't stay, they close at 9 pm and if you pay to enter this place, it has a booth at the entrance and you pay there.