1 gets complicated when the head is worth less than 500TC. It's sad, but a lot of textures aren't worth bat guano. For that reason I'm not for this rule. If posts are unreasonable, though, like a 5k TC head being offered 1TC, that stuff'll get Useless Post.
2 is subjective, and hard to moderate. Like I said in 1, the texture market is full of substandard bull, but you can't stop them. TTM used to have this thing called TTM Approved, which was basically an incentive to improve your art to the TTM standard, but TTM is hecka dead now so I have no idea.
3 that stuff gets infracted under Ignoring Rules. No worries.
I feel your pain, dude, but TBH this stuff is a problem with the standard of the texture market, and there's no quick measure to fix it.