It sells. I wont buy it, but someone will. I find that the best lyrics are pure nonsensical poetry, that people try to find meaning behind, where there really is none. Write what you're good at, write constantly, and let the cream rise to the top. I've written hundreds. Some music, some lyrics and some both. Even if I have no talent, there is bound to be some good ones. It depends on what kind of music you play.
My opinion is that unique lyrics are the best, but mainstream music doesnt like unique, cuz then they have to find talented bands, instead of cramming so much mediocre garbage down the worlds throat, the they just have to replace the trendy bands, which is easy cuz they are a dime a dozen. thats a lot easier and cheaper then searching for truly talented bands and giving them a budget to do great production out of it. There will NEVER be another band like Zeppelin, even if a band has that kind of talent, because the record companies wont produce it.
Write whatever the hell you want. If its good, its good. Its not a bad move to have a couple AFC songs an album cuz people can relate to it.
Thats the ticket: Write lyrics that people can relate to.