Like I said in another post, the cost comparisons between pre coiled heads and using an RTA is HUGE over time.
With the small Aspire bvc heads I get about two days worth of vaping before the air flow starts to tighten up and the flavor drops off. Maybe 4 days if I am not vaping like a fiend. With most of my RTA's I can get at least twice that before the coils get gunked up and I need to clean them, or I burn my wicking in half. I have several tanks and change flavors often so I end up recoiling or re wicking something every day or two.
And with an RTA I don't have to change the actual wire coil that often. I can just pull the cotton out, fire it up and burn the coil clean. Then put new cotton in it and I am ready to go.
I can get enough materials (cotton and wire) to last me about a year for around 15 bucks, probably less actually, I was rounding up when I figured it up. 100 ft of wire gives me roughly 150 to 200 coils at the resistance I vape at. At 4 dollars a coil head for pre made coil heads that comes up to around 600 dollars! I will keep rebuilding thank you very much.
I won't deny that using the pre built coil heads is easier, because it is. But it only takes me about 5 or 10 minutes to recoil and wick a new coil at this point. Would I want to it while out and about, heck no, what a pain. But while sitting in front of the tv or something it isn't a big deal to me.
Price of the tanks is about the same unless you going to get an original Kayfun, they are expensive. Otherwise you can get a decent rebuildable tank for between 20-40 dollars. The down side is as I found out today they are getting harder to find in local shops in my area. Nobody carries many of them, if any because the simply don't sell as many as the other style. One of my favorite shops doesn't even carry wire anymore WTF! So I guess I am getting my next tank via the internet. This will be my first vape purchase online. Everything I have bought so far for the past 6 years has been from local shops.
Oh, and some tanks you can do both on. Like the kanger subtanks. You can use a pre built head, or they have a rebuild deck you can screw in instead. I have two of those and they work pretty well.