Good first partnership or not? 1/6th Cherokee 140 Share in CA

This was going to be my question.
There are currently five partners. They need a cash infusion for
upcoming maintenance. Just add a sixth partner at a buyin of $5,500.
Oh, by the way, the engine overhaul will be $18,000. Let's see, six
partners, that comes out to $3000 apiece.
You recently joined, now you have spent $8,500. Viola... you are the
money partner!
Where has the other $5,500 gone? Are other repairs performed?

Otis Winslow wrote:
It would be interesting to know the history of this partnership. Do they
just sell another share whenever a big maintenance item is coming up?