By Dan Weil Private equity investors are enticed by the seemingly never-ending growth in sports-franchise values. Private equity firms are stuffed with billions of dollars to invest, and pro sports teams are selling for ever higher amounts, making them unaffordable for nearly all individuals. So it makes sense that private equity firms would get into sports team ownership, and that’s exactly what’s happening, though leagues generally allow just minority stakes for the firms. In 2021, private equity firms doled out $51 billion on sports deals worldwide, with $3 billion buying minority stakes in…