I use SparkLoop as well. Even got a 15-minute orientation with the founder when I signed up with ConvertKit. SUPER valuable 15 minutes. Fewer tiers work better for sure, and also, pro tip: many people will have a second email address they will “refer to themselves” so be prepared for that. Most people won’t cheat like this, but some will. So don’t give away cash or anything for something people could take advantage of you for. Other than that, SparkLoop is AWESOME!