As with many things in this saga, there have been multiple varying statements about this. The funds for the "failed" version (I believe more than the amount originally solicited for the campaign) were rolled over into the new campaign, which was funded far above the requested amount. For anyone who understands the economics of production, this means it becomes cheaper to produce the product: You have both fixed and variable costs, and more funding means more items, in turn meaning the fixed costs represent a smaller share of the cost of each item.
Nevertheless, LH has stated he realized very early on that producing the Wave would lose money. In a situation of overfunding and thus proportionally smaller fixed costs, this means the original product planning was extremely poor - rather hard to accomplish for a small consumer electronics item.
Once realizing so early that actually providing the item would be a money loser, the obvious next step was to provide refunds, since this would be less costly and much quicker than production. Instead we are told LHL did the opposite, ramping up development efforts at greater cost than previously planned; efforts which produced precisely nothing, though that isn't what updates related at the time. We were provided ever-evolving ship dates rather than being told this large expensive team was utterly unsuccessful at designing anything that worked - which surely would have been evident internally rather quickly.
In an environment where items of comparable or greater sophistication were prodiced in far less time at lower cost to backers or purchasers (Pono and the Dragonfly series come to mind immediately - I'm sure people can think of others), none of this - that Wave would be a money loser to produce after being overfunded; that it was known to be a money loser to produce, so the response was to throw more money into production; that a large expensive team was utterly unable to get to even a working prototype stage for a not unusually sophisticated item in this space (portable consumer audio electronics) in several years' time - makes sense or hangs together for me as a coherent explanation.