Some of us make assumptions that the audience cannot tell the difference between someone doing everything themselves, someone doing most of it themselves, someone doing not very much themselves and someone doing virtually nothing themselves...
Me, I hold my audience in higher esteem than that. Personally, I think that they are willing to listen to something FAR less good than the CD as long as they can see that you are actually PLAYING it.
When they see your hands off the keyboard for elaborate intros, when they see you barely playing anything while a full orchestration comes out of your keyboard don't EVER think that they can't tell the difference. You insult them thinking otherwise.
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An arranger is just a tool. What matters is what you build with it..!