There are some threads that have hundreds of posts, a complete u-turn from the OP and yet people still come on 3 days later repeating the same advice over and over and over and over and over again.
They appear not to have read anything other than the initial post and clearly aren't curious enough to see what 700 other people (including the OP) think.
Is it worth considering only having the option to reply once you are at the end of the thread? This still won't guarantee that they read anything, but the fact that they cannot respond as soon as they have skimmed the opening post might just make them stop and think.