Umm, doesn’t look like a scam to me. If he has a lvl 17 buff, means he has a Monster Gem on. That’s giving a True +1 Lvl up on the skill.
The Divine Might +'s may be scamy, so I just went to test…
To test it, I just bought a Sacrament (lvl 11, +43 Holy Attack) from a Pardoner Shop. She had no Monster Gems on, so she must of upped it with Divine Might. The skill indeed was a true LvL 11 Sacrament, and gave me +43 Holy Attack. So one of 2 things are happening here… either the “Divine Might, Log out” glitch happened, and the skill stays on and truly buffs the spell shop all the time. Or this pardoner has a C2 Priest casting Diving Might over and over to get true 16/16/11 buffs.
I will test more later, but I suspect that Divine Might (log out) is working just fine on the Pardoner Spell Shops, and when you are buying a 16/16/11 Buff, you are truly getting a 16/16/11 buff. (And if the Pardoner has 3 Monster Gems for 17/17/12, then you will be getting true 17/17/12 buffs from him as well).
Has anyone noticed buying from a 16/16/11 Spell Shop and getting a 15/15/10 buff? Cuz I haven’t seen a case of this happening yet.
EDIT: Honestly Divine Might SHOULD up the levels and allow pardoner’s to sell buffs at a +1 lvl… that is what Divine Might does… the only glitch here I see is that Divine Might stays on all the time (other than the 60s) when they log off. That should be fixed, and if a Pardoner Shop wants 16/16/11 buffs, they need to cast Divine Might (or have someone else cast it) every 60s. I see no problem with that. And of course Monster Gems are fine to use as well for another +1 in LvLs.