I keep one bike that is dedicated to winter riding and it keeps it's studded tyres on year round and have several spare front rims with studded tyres that I can swap into other bikes... the front tyre is most crucial for control and the conditions do not always warrant running a studded tyre front and back.

Rode for years with a single studded front and over tens of thousands of km had one crash that put me down and went to dual studs after I fragged my back as I cannot recover quitre as quickly and crashing could also mess up my back even worse than it is.