Mods can demand verification for any guide that is sold. Mods can use any guide they verify for free. There's obviously a problem with this, regardless of whether it's real or only perceived: you're essentially forcing members to give benefits to staff. (Although, I'm glad to see 10m+/hr guides no longer require verification automatically).
Moving on, selfish motivations are a great quality to look for in someone who you expect members to trust. Mods have been known to leak even the trivial information from the lower lounge; what makes you think the verifiers can be trusted not to leak dupe glitches and such? When the seller wants $100 for one copy, and the mod got it free, the mod's going to be the one asked first, either for a discounted sale or as a friend. Thus, they're being trusted on a similar level as OMM's (for a leaked method can cost the seller plenty), and yet they go through none of the process.