for me it is the other way around:
private: Play & mess around. Gathering knowledge/expertise. Modifying/experimenting on a production machine is just not possible.
company/business: Use the knowledge to source (or modify it into) a reliable solution. After all, you are paid to produce good outcomes/results.
That’s fair.
$10 retail
approx. $7 for the manufacturer (30% retail)
cost 2x “formular”: $3.5
With packaging, this might cost around $3 to make.