It’s way too easy to think “I can get 10 PCBs for $5, and the total BOM for this is only X on LCSC - what a rip off!”
This ignores:
Assembly costs, Shipping, Taxes and duty
And then when you actually sell something:
Packaging costs, Distribution costs, Platform fees, Things getting lost in the post, Refunds, Etc…
A good rule of thumb is that you need to charge at least 3x your production cost to actually make any profit at all.
And all this ignores the actual time that’s invested…