How about I wait to practice piano till people are home?
That's strange. Why do you want to wait to practice the piano when people are home?
Because I like an audience.
It is good to practice playing an instrument but it is not good to only do it when other people are there. It will annoy them and they will stop coming over.
That's fine with me. They are so annoying. I can't believe they won't let me practice the piano when they are home.
They don't want to because it is annoying to hear somebody who is learning mess up while playing. And you shouldn't want people to suffer and be aggravated just because.