I agree that humor sites are tough but there is always a way to break into competitive niches. If I was marketing in a competitive niche like... using one of your examples...Fender electic guitars, I won't bother trying to get my site to rank very highly for this term.
You say that you're article marketing, which is great. So find keyword phrases that relate to Fender electric guitars and try to write articles for those terms. Submit them to sites with link popularity and sites that Google loves like Squidoo, hubpages and ezine articles and link back to your site. In the meantime optimize your site for Fender electric guitars.
To me, every competitive niche is 'crackable'.
Jay
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