It really as complicated as you are making it. I came in during Untamed and bought packs. I even bought the some vouchers at $20+ dollars to make it to 100 in a buy with a friend during the CL presale. I even bought some RW packs. At $4/pack for rebellion I drew the line for all the reasons that psilence pointed out. I bought 3 packs out of boredom one day and never again. I'll pass on Conclave as well. I imagine I'll get tired of buying wild cards at some point and lose interest in the game entirely as deck building is one of the most enjoyable parts of the game for me.