Meta SE seems to attract a much higher percentage of low quality, off-topic and spam questions than any other SE/SO site (Meta or Main) that I frequent.

To help keep quality on Meta SE very high would it be viable for there to be a very high minimum reputation set to post here direct e.g. 20K across all sites (or mod/staff status)?

And then to require that all other questions arrive via migration from a child Meta?

There seem be some Q&As around like Which meta am I supposed to post on? that suggest discussing/vetting issues on child Metas is sometimes/often preferable to posting here first.