Monthly Cost w/Insurance: $400. Profit: $69*30 Days * 90% = $1,863 Revenue - 25% Fee = ~$1,400. As you can see, it is possible to make anywhere from $1,000-1,500 per month in profit off of one BMW. The price can vary a lot though because you can give discounts to renters if they rent for a week or a month. Calendar.