To calculate your estimated return on a premium fulfillment, select a product, the number of colors in your logo or design, the donation level you will be asking for, and the number of donors in your email list.
The resulting table shows your estimated return based upon quantity breaks for the product you selected. If you know your average conversion rate on emailed donation requests, you can get an idea of how many products you would need, and what your estimated return would be for that number of products.
Keep in mind that the results of the calculation are simply an estimate. Product and shipping costs are subject to change, and product options, such as color matching, can increase the cost of a product, thereby reducing your return.