Pricing Manipulation

Why does Roborock change prices frequently? I have been monitoring prices of various products for past couple of months. Just as an example - particularly, since Thanksgiving, S8 MaxV Ultra's price has changed constantly $1099 -> $1499 -> $1299 -> $1099. They listed this product on holiday sale for $1299. This sale ends on 12/31. Today it's price changed to $1099. I have seen similar changes for Qrevo Master. Why do they change sale prices during the sale period? Do you all keep track of these prices? Did anyone reach out to customer care to match the price if you saw the reduction in 30 day period since the purchase?