No it indicates that there are no dust transactions, because of the 0.01 transaction fee 
Not really, since PoS minting can generate a lot of transactions without fees. PPC actually uses a different algorithm for storing the blockchain. I don't know about the technical details, but Sunny King worked some magic into it.
The PPC wallet also has some magical compression, I have several thousand transactions in my PPC wallet (mostly from PoS minting), and it's 302KB.
I have 500 transactions in my Bitcoin wallet, and it became huge, over 10 megabytes, and takes a while to load.
Sweet! This combined with the low inflation rate definitely makes it THE long term investment coin :]