..the reason why I don't think it is a good idea to sell the board with pin headers soldered is that the pin headers take up a lot of space, especially when they are used. that is, wires with connectors are plugged in. many users would buy the board because is is very compact. but the connectors would really make it difficult to fit the board into a small space, compared to if you just solder the wires into holes. and soldered connections are a lot more reliable than pin headers and matching connectors. so I would definitely sell the board with pin headers but not soldered. it can be difficult to remove pin headers that are soldered.
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..the reason why I don't think it is a good idea to sell the board with pin headers soldered is that the pin headers take up a lot of space, especially when they are used. that is, wires with connectors are plugged in. many users would buy the board because is is very compact. but the connectors would really make it difficult to fit the board into a small space, compared to if you just solder the wires into holes. and soldered connections are a lot more reliable than pin headers and matching connectors. so I would definitely sell the board with pin headers but not soldered. it can be difficult to remove pin headers that are soldered.