Why is the price difference of SLR cameras quoted by Taobao too big?

For SLR cameras that have not been delisted yet, the average market price of machines purchased through formal channels (Bank of China) can refer to the quotation of JD.COM Mall (divided into stand-alone cameras and standard sets). The profit-making sales of individual businesses can have a profit-making space of 10%, and the origin of the "China Bank" model with a lower price (above -30%) is questionable. The routine of Taobao merchants is to quote a "fishing price", and there are many options after clicking. The low quotation is actually a low-end model. If you choose the desired model, the price is much more expensive than the quotation. For example, a Taobao merchant Nikon D7500 SLR quoted 4258 yuan. After clicking on the link, the quotation for selecting the D7500 monomer (official standard) of the Bank of China becomes 5200 yuan, and 4258 yuan is the quotation for one of the options, D7200 monomer. This is the routine of Taobao merchants.