Upsells should not be limited to 10 options. Our organization offers t-shirts as an upsell and we provide t-shirts to toddlers, children and adults. T-shirt sizes range from 2T - Adult 3XL (13 sizes). With only 10 options in 1 upsell, this forces us to create 2 upsell options (youth t-shirts and adult t-shirts) which could confuse our users. I don't see why upsell options are limited, especially if events are selling things like food, t-shirts, merchandise, etc. 10 is not enough.