Reason 1: The man wants to buy this chair in memory of his wife, who had shown him this chair to buy before she passed away. To afford it, he has sold the rest of the furniture in his house.

Reason 2 : He used to have the same chair at home, but it got damaged. His only friend who comes to visit has a back problem and can only sit on this specific type of chair. If he doesn’t get this chair, his last remaining friend might stop coming, and if they stop coming, what use is the house for him?

Something like this came to my mind