IMO it would be foolish not to. Bikes take maintenance but so do sleds. I don't even know how many hours I've put on all my various bikes over the last decade of snow biking but it's a lot. When you read about rebuilds etc. as in this thread you need to understand it takes a lot of riding and a lot of days to put 150 hours of runtime on a snow bike. Most guys won't have to do any major maintenance for at least three seasons of typical use, say 40 hours engine time. On 2 bikes I do probably 100-125 hours per season which is a lot. If you can't wrench and plan on riding 30-40 days a year maybe a sled is the better choice, that said I'd never go back.
M5
M5