Surprise, as a customer myself I don't share your anger.  I am always suspicious of marketing people and what they say - they are trying to sell something.  Which is why I read the contract and understood it before spending large sums of money.  Do you get surprised when your cell phone company charges you an early termination fee?  It is in the contract, but not often mentioned by the salespeople.  

An electronics development doesn't take exactly X days and you might say well add more people if you start to drift late - but it is commonly understood that doing so ends up making the project even later as the new people have to be brought up to speed by people who would otherwise be doing the actual work.  The marketing department at cointerra could have built these expectations better for what appears to be a bunch of non-technical early adapters, but they probably weighed that against the other players in the market and decided to go with the more "traditional" (for btc mining co) way with a target date conveyed as the expected ship date.