There are multiple benefits to such a paid and "sold" model.

If a member settles down and buys this five-year service of four plus one, they pay the fee in advance. Of course, this fee includes the cost of the instrument itself, the cost of supporting personnel services, and there must be profits.

For the operator, the risk is very low, and all the benefits are obtained in advance, and you can rest assured that you can hire people and rent office space.

For customers, there is generally a chance to try it for free

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