For our products, the pricing is determined by the cost. Costs are determined on a per production basis. Things fluctuate, the price of copper changes every day, suppliers re-negotiate, etc. For the 58X, we committed to producing 5000 units, and secured our costs for that number. During the launch, we said the price would only be available for the first production because we committed to 5000 units, anticipating those would sell based on our data. Instead, it reached ~3200, leaving us with ~1800 units that were produced at a cost that allowed us to sell the product for $150. Over yesterday and today, most of those units have sold.
Based on the quotes we have, it seems unlikely that the same cost can be achieved (global material shortage thanks to "smart" everything + impending trade war makes for a sellers market) for future production runs, so you'll probably see the price for the HD58X increase to $159.99 or $169.99, not to mention the HD6XX.
It's frustrating to have expectations change, and we're working to find ways to improve the experience for those who join early. We appreciate you massively and so does the rest of the community, had we not sold as many HD58X as we did, the product would have been canceled and sales refunded, but that's an unintuitive thing to appreciate because we're used to companies taking financial risk to produce things in advance and off-setting that risk through high prices with fat margins. Instead, we take a lower margin to reach a lower price and achieve that by limiting our risk through pre-sales.
We run a fundamentally different business model and describe it with confusingly familiar words. We're working on a number of things to help explain this better in the future, and we appreciate you bearing with us, regardless of future purchase decisions.