Previously, when I printed cards, I would proactively inform people that they needed to add a watermark for an additional fee of 50 yuan per 600 cards, either pick-up or cash on delivery. This was not about making money; it was primarily to provide convenience for everyone, so I needed to promote this service.
Later on, with so many people involved and busy, we simply stopped adding watermarks and promoting it. Now, it's essentially passed from person to person.
You won't make any money this way; it's entirely based on passion. 😁
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