You don't support a political party and nor do I. But the people involved do and I'm sure there are political forums that are the equivalent of this forum.
Different perspectives on things come from the different interests people have.
Back to analogy, if Parramatta Leagues Club didn't fund or have an interest in the Parramatta NRL team, then Parramatta NRL probably wouldn't exist. But as you've pointed out, just like the Labor Party, someone else would replace it.
Having said that, I think it's unlikely either will cease to exist anytime soon.