I think there is nothing wrong with supporters clubs, in whatever form they take.
One thing I would say is if they are raising money under a club's brand, then they should have audited accounts each year.
I don't know if that is the case, but assuming it is, then they can do whatever they like with it.
The fact that they use the Berwick Bandits brand always opens them to a certain amount of legislation, which has always surprised my why they haven't called themselves something different.
The tax man can hook onto something like this very quickly, and aggressively, especially if historically the funds have been raised in - or around - the organisations base (i.e. Shielfield).
But I am pretty sure there will be robust auditing of financials in place, so - as the old saying goes - "move along, nothing to see here".