Once you redeem your BTS from your PTS, is there any point in holding onto PTS? Also, once PTS are already used to redeem BTS, can they not be used again? So someone buying PTS won't know if they're getting PTS+BTS or just PTS?
You never lose your PTS, you'll just get additional shares in every DAC. So say if you're holding on to 100 PTS at the launch, after the launch of BitShares, you'll have 100 PTS + 100 BTS. The value of PTS might fall but it still has value because Invictus or other community members might come up with other DACs in the future and honor the same social contract of giving initial shares to PTS holders. Invictus has publicly announced their social contract - every DAC they create will be forked from ProtoShares which means by holding ProtoShares, you get a share of each of the Invictus DACs in the future. That's why they're valuable.
Ah, I see. Do I get Keyhotee rep/name for holding PTS?
Is there incentive for other groups to release their DACs forked from PTS? Or is the success of PTS post-BTS launch pretty much entirely dependent on the success of Invictus' other DACs?
Regular Keyhotee IDs are mined for you by Keyhotee at no cost other than a little of your computer's time for proof of work purposes. They are first-come first-served by the Keyhotee network.
The incentive for other groups to honor the ProtoShares Social Contract is that they instantly get the attention and buy-in of everybody who already understands and believes in the potential of DACs. All the early adopting True Believers by definition are ProtoShareholders. We believe that the desire to inherit that community, (and the fear that if you don't honor them you leave the door open for a competitor to do so) will cause a lot of third party developers to honor the social contract.
The existence of a knowledgable and motivated
DAC Angel community of potential investors interested in leveraging their PTS holdings might also influence whether they want to go it alone or not.