Extending what Frank had just laid out -
If it doesn't make an improvement on par with the cost to implement, it's just not really going to be worth it on an economics scale. We're always searching for the "low hanging fruit" because you're already burning more calories than an apple provides when you eat it... why burn thrice as many getting to the apple, when there's one on the stem right in front of you?
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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