My initial choice for CCBYSA is that people can buy the assets, make their own works, and sell them just by crediting me and sharing any derivative art in the same way they got it.
People seem to be confused by what that means, if they have to share their code, package all my art assets, etc. Of course, this isn't stipulated in the license, but -- there's confusion even amongst the folks who go to the CCBYSA site.
I'm glad I'm hearing more support for CCBYSA, and I'd really like to dig deeper into this rabbit hole. Here's a more clear critique that makes me maybe want to do CCBY:
"By-SA faces some real difficulties in interpretation. A reasonable interpretation is that only direct derivatives of the assets themselves have to be released under the same license, but there is some fear that it might work out to requiring the entire project or any touching assets to be released under the same license, which would be a huge mess. When I was making openly licensed game art I gave up and licensed it CC-By (and OGA-By to avoid concerns about the anti-DRM clause in CC-By)."
I interpret it the first way, but I worry that the confusion will push people away.
Of course, other critiques are that CCBYSA is too free and people will just outright reupload the asset pack in it's entirety which would also be bad :(