It's not necessarily being cheap. Not that I can speak for the OP, but the wife and I have shared an Apple ID since way before family sharing was around. Once that came out, we have tried multiple times to set up for family sharing with multiple accounts and have had serious issues ever time. From contacts not sharing, calendars not sharing, music and purchases not sharing.
After the third time of trying to set it up and it wiping my wife's phone of contacts and calendar events, and not copying over no matter what we tried, she told me no more. SO we are back to sharing an Apple ID. It works for us.
That being said, we tried Apple Music when it first came out and yes, if one device on the account is using it and the other tries to use it, the first user will get kicked.