I had a guide available, I pm'd a few official verifiers it, no one replies, others were saying busy, etc.
People would not want to buy the guide until others have bought it and left their feedback, if a trusted guy would say, the guide is good, and works well, the others will listen to their feedback, and more likely to buy the guide, it is the choice of the guide seller on who's word matters, and who doesn't, the unofficial verifier cannot move it to the verified section, and the buyer can not claim it is verified, so it does not matter.
It's like opening a restaurant and giving out free samples of food, so people have a good feedback on the restaurant, you don't have to get certain people to try that food, anyone can do it, the buyers will decide who's word they will listen to, and the sellers can decide, who's word will help others buy their guide.