I think its harsh that people are getting burned on this, and it must really sting that this was with promos but I really think that the horse is out the gate on this one.

You are never going to be able to restrict access to music like you could 10 years ago.
The moment something goes on sale someone will sample it and distribute it. It becomes digital even if you only released it in vinyl.

If you can't beat'em, join 'em. Sell your tracks online, cut down on production and distribution costs and use music more as self promotion.
The more people that know and love you the more will pay to come and see you perform.

I feel for people on this but I don't think anything is going to stop this.
Sorry to be a downer.