Not sure what thread is now the right place to post technical questions, so gonna post here:

* If there is no mining incentive, why mine the chain?

* If difficulty is low enough for joe public to mine their own transactions (and assuming only the sender can mine his own transactions), doesn't that open the chain to attack by server farms under the control of one individual?

This guy's post and my response to it I think define what "Blockchain 3.0" will be and what metrics are actually important for it:

https://bitsharestalk.org/index.php/topic,18434.0.html