I doubt if I would ever pay someone to have my song evaluated. When I had my so far one and only demo made(certainly do hope more will follow, but can't afford them right now), I let the lyrics stand on their merit. I find it hard trying to critique other people's work since they had their reasons for writing what they did the same as I did. You will see me giving some evaluations but seldom suggesting changes for that reason. The one I did have demoed was a rewrite of something I did about 30 years ago.