A capital letter at the beginning of a word does not determine importance, despite evident feelings to he contrary. Nor does a lowercase letter at the beginning of a word diminish the word's importance. The most important word in any given sentence is the verb - and, unless it is at the beginning of the sentence, verbs are not capitalized (except in cases of trademarks that have become slang - "I Bedazzled my jeans").
The noun is really secondary; the verb gives us the action, and we all enjoy action, right? Especially copy editors. I certainly love action, in reading and in life. What I don't like is overinflated ego, and I think, visually, that's how I interpret improper capitalization. Capitalization, though, should be reserved for proper nouns and the first letter of the first word at the beginning of a sentence. Instead of designating degree of importance, capital letters serve as a tool, one similar to the copyright or trademark symbols.
"There aren't enough Apples this season."
"There aren't enough apples this season."
Speaking of overinflated egos...that first sentence makes Apple a proper noun, which indicates you'd like celebrity fruit names to become a trend. In the second sentence, we are referring to something that grows on a tree and feeds people.
Is one of those nouns more important than the other? I would argue affirmatively...and it has absolutely nothing to do with whether or not it starts with a capital letter!