There are different scopes for different applications. IMHO, spending more that $500 or so at the most on a scope for a deer gun is not really a good investment. It's an area of diminishing returns. Do you really need a photographic quality lens for a 300 yard shot on a deer? Do you really need a scope that's been tested to withstand 30,000+ shots on an H&H on your 270? Once you get into the long range stuff - precision shooting, target and the like, then maybe you can justify something more expensive. Or maybe for the once-in-a-lifetime shot where 100% reliability is utmost - say on safari, or with other dangerous game.
The more expensive scopes certainly a pleasure to use. But I really don't think they're as much of a necessity as a lot of people seem think. I'm sure we all know someone who brings home the venison year after year with a $50 Tasco without fail