I can’t speak to everyone’s experience, but I did my 4 and got out in 2020 due to a physical injury. While I was in it wasn’t great, but my wife and I collectively made about 100k/year with her as a teacher, we lived pretty well.
Since I got out, I attend school for free, receive a housing stipend, don’t pay property taxes, receive free healthcare, and I’ll receive about $50k this year in tax free disability. My kids and wife will have tuition if they decide to go (back) to school and they all receive free health insurance.
I don’t think there’s a lack of incentives at all, but simply people don’t know of the benefits they can receive. No one sits down with them and explains it all and we end up with vets with PTSD on the streets because of it