Not trying to be confrontational, but I’m surprised that you appear to be surprised by the SA’s “business model”.
The SA takes those donations and converts them to cash in order to provide funding for many of their efforts...the “management” are paid a very modest salary...last I heard, over 90% of what the SA takes/makes is returned to the community.
Local shelters or Christian “resource centers” might be a better place to look when donating clothing specifically to help clothe the needy.
I’m glad that I’ve been corrected about the Salvation Army. They are better than the rest at serving people in need. For me personally, if I donate clothes it will be directly to people. If I donate to the Salvation Army, it will be cash.