Twinster2 is correct abut the cost of inside winter storage vs the cost of a cover.
However not everyone has adequate space to store their campers at home without creating huge snow drift issues.
For some, it is a benefit vs cost issue.
2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.