To be frank, even run-of-the-mill lagers differ in taste considerably depending on the brand, but usually people have their favorite and do not keep a variety of the same type of beer. Once you go into some other beers though, I can fully see someone keeping lagers, porters, wheat beers and other types as they are very different drinks the same way as red and white wines are not interchangeable (same goes for the sweet/dry distinction).