This is why reading comments before contributing to the conversation is useful. There are already several comments outlining why a $25 wheelchair, especially a used one found at thrift stores, isn't comparable. Build quality, weight, fit, convenience, portability - all of these are reasons to spend more on a wheelchair.

We don't question why different computers are more expensive than others even though they all do the same job. We don't question why one bike costs more than another despite using the same mechanism for propulsion. Wheelchairs are another good with varying levels of quality at different price points. It's arguably more important for quality goods to be accessible because for many, they're living in these things constantly.