Whether you agree with the notion or not, I've seen plenty of investment strategies that include remortgaging your home to invest.
You bought your house for 58,000...now it's worth 100,000. Rather than attempt to get a mortgage for a theoretical rental property, remortgage your existing home, and buy whatever rental property you want. The rent now pays your mortgage, and you own the rental outright. Lather, rinse, repeat. I've seen it done plenty. It's not 'abnormal', it's perfectly legal, the banks love you for it, and you're merely moving your investments around as you see fit. Just because someone else wouldn't choose to do it the same way doesn't mean diddly squat.