In all fairness, its been 1 month and there have been multiple bumps with not one mention of downpipe cost anywhere, let alone deposit amount. No discussion of time frame for these dumpipes or any other details.
In regards to the "Interested pending cost", I think that's a valid expression of interest. Considering no mention of price was made. Its just like seeing an ad on TV for a product that's getting released in the next few weeks with no mention of cost. You say to yourself, "I'd like to get me one of those, depending how much it costs". Sure, if it gets released and its within your price range, great, but if its not in price range, what are you gonna do? Take out a loan just to keep your word?
I think the idea and intentions behind the group buy were good, but personally I think there was a lack of communication in terms of pricing and time frame.
/My 2c.