Well, they say that they use better materials in atties because they are supposed to last, while the cartos are throw away so no need to use the better materials.
I use 306 not 510 and I pay $9 apiece for my cisco 306 atties, while I can get the boge 306 cartos for $1.60 each.
Now, the standard I used when I was using the boges, was 6 ML per carto. In other words, when I started up a new carto I put the
juice in a 6 ML bottle and when that ran out, it was time to throw out the carto. I should say here that, on the cartos, my main
vape (Puresmoker Silver Leaf Menthol) had no problem with that but some of the thicker juices (cafe mocha, etc).... well.. at times I had to jam a paper clip up through the boge to get it unclogged and when the carto was getting near the end on these... did not taste all that good.
In any case, what this amounts to, is if I get 30-36 ml on an attie, that is the break even point. Less than that and I am spending more money on atties. If I get more than that, then spending less money on atties.
For my main vape... no problem. Can go a month or more on just one attie (dripping) and that might mean 200 ml or more.
But, on the thicker juices... sheesh... 6 ML is the standard before the attie needs to be dry burned and some only make it through 3 ML.
So, before I learned how to dry burn and remove the scabs that develop on the attie
coils, it was cost prohibitive to vape these thicker juices on atties.
But, then I DID learn how to dry burn (watched some youtube videos) and, the dry burning gets rid of the scabs (tried just about EVERYTHING before that and no dice), and if the atties can make it through 5-6 dry burns, then that is the break even point for them.
So far, so good. Haven't burned out any of my bridgeless cisco atties yet but I don't believe any of them have gone through 5-6 dry burns yet.
In any case, with boges they tended to not taste as good once you got past 3 ml or so, and then there was the cardboardy taste underlying. So, now I just drip, except I still use boges on my Joye 306 which I use when I am up and about.
Hope this helps.