We successfully sold 1000 licenses of our product Ultimate POS in codecanyon.net marketplace.
Here are some of our learnings:
Keep the product super easy in terms of installation, user interface, usage.
Use simplest technology because few customers are actually developers, who customise the app to deliver to end users.
Keep the document updated with every technical & usage details and easy language. This helps to reduce the support queries. Generally u will find lots of support question, so this helps to save a lot support of time.
Keep the users updates with recently released features, upcoming features.
Sad but a true point: keep the price low. We started with $29,revised our price 5 times to reach $54. Still it's low as compared to the features it provides.
Product link: https://codecanyon.net/item/ultimate-pos-stock-management-point-of-sale-application/21216332
Any feedback, suggestions, questions highly appreciated!!