Well I think if you are a business partnership in an LLC or corporation, you can chose to sell your share, be bought out, or sit on the shares you contributed to the organization and hope to make money. If Perry was a partner in an organization he helped established, he could hold onto those shares as long as he wanted to and still be paid dividends on his investment. Those songs and recordings were part of an investment he made in Journey. I don't believe they actually cut him a share of the gate proceeds of each tour. That's not how it works. But if his agreement was to let them continue on until xx/xx/xx date before selling his share of the partnership, and the other partners agreed to it, then it sounds like a win/win for everyone involved. That's not extortion, that's just the real world business side of being in a million dollar band.
I'd think it'd be natural for the remaining partners, as old as they are, to feel like rubes out working their asses off while another silent partner sat at home collecting dividends, but here's the deal:
1) Perry, the silent partner, helped build that brand and partnership, and is due dividends as a shareholder
2) The other partners in the group agreed to whatever terms there were....or maybe they couldn't afford to buy out his shares of the partnership at the time....In either case, they've no just cause to feel ripped off
3) None of this could be the case, or all of it could be...who knows, and more importantly, what difference does it make?
