Tourism revenue might see a boost though, but that may decrease over time if other states adopt legalization. It also may be offset by an increase immigration of drug users and emigration of non drug users (assuming you can accurately predict non drug users are more economically valuable than drug users)
Just looking at the topline number I think is pretty meaningless. I think also couching legalization in term of economics might be setting things up for failure and it might make better sense to say it's just philosophically the right thing to do(??)