Some people appreciate the history. I've got a fondness for Springfield Trapdoors and Sharps rifles. Then again, maybe it's the looks, as I like Ruger #1's and Remington Rolling Blocks as well. Or maybe having more than one shot is frivolous
Disregard, I see you were asking about single shot BOLT ACTION rifles. Well, the history part still applies. The "needle rifle" and Chassepot were the early French answers to the breechloading cartridge arms question, whereas the U.S. chose Trapdoors and the British chose Snyders instead. In fact, later military arms were often loaded one round at a time in bolt action repeaters, as it was thought allowing a man to fully load his rifle would result in undisciplined, inaccurate fire and waste ammunition.