Solution

In Tobi's eyes, each one of his family was more precious and valuable than any money, except the b*stard Tim. He loved them deeply, and as much care for them.

He wasn't willing to let anyone or anything, not even the hateful villagers or any sort of illness, take his loved ones away from him.

He suffered at the thought of how little they could enjoy from life because of him. To allow Belle to experience more than just sitting and looking at everyone, Tobi decided to sponsor his father's idea to buy some sort of wheelchair-like for her.

If anything was to be inferred it was he wasn't really impressed with what this world called a wheelchair and deemed it nothing special, since it was made from a pile of meta and wooden plank made into a wooden chair, with two backward handles to be held, with four legs for the four circular shape wheels. Equally distributing the weight among them, and two locks for the wheels, to maintain safety.