Whitepaper and FAQ are not quite up to date but you get the idea. From: https://github.com/nmushegian/dns/blob/master/whitepaper.md#...
- Namecoin issues new coins to miners as a reward for performing merged mining with the Bitcoin network. The namecoin supply is being inflated at nearly 30% per year for several more months, then over 10% for the next several years. Domainshares only ever shrink in supply, when fees are destroyed as implicit dividends.
- Namecoin attempts to service multiple namespaces at once. .p2p is highly specialized for servicing the .p2p TLD namespace. The use case is the same as Namecoin's "d/" namespace, which is used for the .bit TLD.
- Namecoin's name registration price is fixed at any given time and is independent of the name itself. Domainshares utilizes an auction-like mechanic to incentivize price discovery for names, making sure the final owner pays what it is actually worth. The majority of the final cost will have gone to the network as dividends by the time the auction is over, with a small fraction having gone to bidders as a reward for price discovery.
- As a result of the fact that domains are expensive and there are dividends on shares but not domains, there is a high opportunity cost to squatting: holding a domain without making good use of it.