cost vs benefit of prophylactic treatments

[ljp]

I see people recommending prophylactic treatments using various fungicides and pesticides. Is this really cost effective for the home gardener or is the object just to get tomatoes at any price. I'm just wondering how the numbers work.

I don't get enough production to justify a fungicide. However, disease hasn't been a major problem (other than a late season hit of late blight one year).