You can determine success multiple ways. I think the two here we are having a discussion about are frequency of use and the number of people using it. Both burners and incursions are run all the time. But by how many people is the issue. The amount of people constantly running incursions is small in comparison to those who do other forms of pve taken as a whole. So I suppose you could look at it from at leased these two standpoints and say it is both unsuccessful in scope but successful in its constant use.
In short these two pve activities and not a massive group and are just a drop in the bucket and overall though some complain there isk being made outside of null. no risk no risk!. There are not a tremendous amount of people doing them yet there are being done all the time.
And the reason you detailed in your post and that I quoted explained why from a overall numbers perspective they exclude most of the player base (though I didnt at the time of my post see there was more than one way to quantify success or failure in this instance). That being expense, skills, travel and reliance on strangers for incursions.
