I won't argue with your points 1-3, makes sense but this was fun building, and long term i think it was for the best. However, i would argue that the value of this currency is not tied to scarcity like bitcoin, or usage like ethereum. Instead the value of Dealta would be based on how well the initial goal is achieved, which is to reduce online frauds. The protocol is setup with timers, that limit how much time can be spent on each stage of a trade, hence limits time wasted when items are not in transit. Given that ebay and amazon take huge percentages, it could in fact be cheaper for the buyer. Its supply and demand. Thirdly, to counter the issue of a buyer holding on to an item, you can simply increase the collateral, lets say with 100%, so a 50% decrease in the coin's price is accounted for, thus making it infeasible. Again, this is something to be decided by the community. My initial argument for making Dealta PoW-based is that much like with any other crypto, whales who think this a good idea, would be able to handle the early volatility. All these things are why Dealta also has a native crypto. Would love to hear more from you!