My first product in 1987 sold in boxes, with floppies that had to be duplicated and a manual printed, plus shipping to distributors and mail order companies. If we were lucky we got paid 180 days later assuming they were sold, otherwise we had to pay to get the unsold inventory back. A later product with a larger audience cost $10 just to send an update, and that had very little profit, since it required all the same manufacturing costs. I never did that again.