Whether your request is seen as "okay" will be subjective and be influenced by the quality of the software, its utility and how the request is framed and enabled - eg via GitHub sponsorship etc.
Your listing of arguments of why people should pay in your post is of dubious relevance because most people here already know that, and while nobody is entitled to your time, neither are you entitled to anybody paying for it if you choose to go the open source route.
However you could always link to a "why you should consider supporting this project" style page that explains those factors to users who may be unaware; or - for instance - provide complementary service levels/"professional" versions at a cost.
Whether your request is seen as "okay" will be subjective and be influenced by the quality of the software, its utility and how the request is framed and enabled - eg via GitHub sponsorship etc.
Your listing of arguments of why people should pay in your post is of dubious relevance because most people here already know that, and while nobody is entitled to your time, neither are you entitled to anybody paying for it if you choose to go the open source route.
However you could always link to a "why you should consider supporting this project" style page that explains those factors to users who may be unaware; or - for instance - provide complementary service levels/"professional" versions at a cost.