merch. review for B2B:Wholesale Pricing Discount

I really enjoy this app, it does most of what I need it to. However, how my business operates, only 1/4th of my sales are made in a way where this app can be used, yet I'm charged based on the total number of orders my site gets. 75% of these orders are from one-time customers at an event and therefore aren't subject to the orders made by my wholesale customers. But each month I pay $199 despite only 30-40 monthly orders being subject to wholesale pricing. If there was a way to segment the orders filtered to the app that influences the monthly cost, then I will reinstall, but the cost for my business exceeds the return. Responsive customer service though!