A lot of people use a HELOC from their primary home to borrow the initial down payment for rental. As long as you calculate all the expenses in and have positive cash flow you can then turn that profit in to bitcoin. Yes, it’s more complicated than simply buying bitcoin but what the goal of a rental is to increase your income. The more extra money coming in means the more you’ll have to buy bitcoin. It’s just like having a business. Yes there’s risk, but there’s also the opportunity to profit.