Racks like the "Yorkville Sound 5-7 Guitar Side Loading Folding Touring Stand" offer convenience at the expense of protection. While it's less likely to tip over like a single guitar stand, the instruments are still exposed to the elements...dust and humidity. Also, all your eggs are in one basket, so to speak. If something catastrophic happens all your guitars are vulnerable (a drunk friend trips, a floor lamp falls, you accidentally drop something...use your imagination) The basic design of the rack is such that if you aren't careful, you could scratch the guitars getting them in and out. Unlikely as they may seem, accidents do happen, and a case eliminates all those risks. So it all comes down to convenience. It takes what...15 seconds to open a guitar case?