Almost never spray - am I just lucky ?

[Patihum]

After reading a lot of the different posts on diseases and pests and everyone constantly using sprays for aphids, mites, fungus diseases etc. I've decided I must be very lucky. Maybe once in the past five years I sprayed with a Bordeaux mixture for blight. And there was the one year that I had a multitude of beetles that were stripping the plants almost overnight that I used some Sevin very sparingly only on the lower branches of the tomatoes. (I know - not an organic choice) Other than that I don't use anything on my toms. I guess what I'm wondering is if certain parts of the country are just more prone to these problems and others less. I live in SE Kansas and most of the gardeners I know generally have the same problems as me with the beetles and blight and not much else.