Kits generally provide you a selection of items at a discount, and when you figure out how much it will cost to buy what you want individually, even if there is a part or two you don't want, the kits still end up being a deal. However, you do want to be clear on what you are going to be needing. Maybe you don't want a wall charger because the kit comes with a usb charger, but the other stuff, you will not only need, but you will need more of.
For instance, kits come with two batteries generally, and you need two, and one of them will die and you will need to replace it immediately. In fact starting with three isn't a bad idea because if one dies and you are down to just one what the hell will you do when it's charging? Even if it's a pass through, you might be out in the wild and it dies and you do not have a backup.
As far as the carts and atties, you're going to be buying a lot more than these my friend, might as well get started out with a deal.
The money you spend on the starter kit is just that, a start, and if you stick with vaping you will be spending a LOT more than this on gear over time. Some folks spend thousands of dollars on them just in the first year, that's overboard I think but that's what they want to do, get lots of gear, try out a lot of things, etc. You can do it much more cheaply but you will definitely be spending more and a lot more than this $70.
In my first year I might have spent $700 or so altogether, including juice, however I was spending almost that a month on analogs so it's still just a drop in the bucket. I didn't even quit smoking the first year, just cut down, and saved over $3K, so spending $700 was a joke. Now I'm off the things and am saving $600 a month now and it's only costing me a fraction of that to vape.
There is so much savings in vaping versus smoking it's almost ridiculous. Some people go crazy and blow all their savings on one PV after another, but starting out, as long as you stay away from the retail crap, you can't go wrong really.