You can spend as much money as you want in GTA on PC every day! There is no point in spending only a certain amount of money to be 100% safe ( The ban rate for PC is less than 1% - no one has been banned in over two years ). However, if you still feel more comfortable spending only a certain amount a day, we recommend spending in the range of 50-70 million a day, but as mentioned before, there is no real value for this.