I can't say that people "underprice" when they make a template and then try to sell it for $200, it's rarely going to happen. If no-one buys then you have "wasted" time, it's much better for you (money wise and portfolio wise) to sell work, even if it is underprice.
Making something completely custom and involving the client allows you to charge higher, for the support during and after, I pay low fees for designs as I just get sent a file and that's it.
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