Trubandloki- where I have seen the range come into play most often is for deals negotiated between agents, or between trainers. I just want to state right up front I am not advocating this scenario, but I have seen it.
For example, agent A is representing a horse for sale. Owner has said they want to clear at least $30,000 for the horse. Agent A has a commission rate of 10%, so plans to try price the horse to ensure they’ll get $35,000 (to cover his own commission of 3k and give the client their 30k with a little wiggle room). Trainer X comes along with a client whose stated budget is $45k. Trainer X has a commission rate of 10% also, and wants to maximize his commission and get as close to $4500 as possible. If price range in the ad is $30k-50k, that works perfectly for Trainer X. Trainer X can talk to Agent A and say, my client has a budget of 45k and your horse seems to fit my needs. If the horse suits the client passes PPE etc, Trainer X can then reprsent the horse to his client at $45k, get his “full” commission, the agent is happy, and the seller gets their $30k (potentially plus). Sometimes too Trainer X will ask for a little “on the side” from the agent for bringing his buyer to the table with a full price offer.
As I said, I have not been involved in these kind of deals and I am not advocating them, but they do happen and I think that is where the range is appealing.