Then what is the point of working? You work because you have bills to pay every month and every day. How annoying it would be to only have money 2x a year. I find it hard to find benefits of participating in this.
They are actually needing to establish a project while surviving through the whole months until it's their turn, they find it difficult to do a large project with the $1000 monthly so if they could starve themselves throughout 6 months for $6000, they could build an automobile business they've been dreaming, they could get to buy a peice of land for themselves.
I think that's the reason while they participate in all these, in fact, participants needs to be much for greater rewards, the disadvantage of this initiative is lack of trust, they 1st person or the 2nd or third may not be willing to deposit $1000 for other round again but decide to hide out, but it's impossible since they both in the same work environment.