You are doing it too complicated. I was the 1st ISS enchanter selling buffs at TOI on Ayotech when my char was level 83 or so, like 22 days ago.
PPl just trade the adena, after the trade u just invite the guy to the party and u make him wait until u fill up the party to start buffing. When my archer was awakening I had it allways in buff party couse of the Yul's Aura for +++ mp and perma profit.
If ppl started to spam me with trades, ****** questions, weird words on different languages than english /block and problem solved.