I will be happy to take your Kabukis off your hands.

The deal with them is they really are the best flavor tank for the Nautilus drop in coils. I have two and I love both of them. I will say that comparing an RTA to a drop in coil tank is a bit like comparing apples to oranges, they will perform differently and I'd say the consensus from most folks who use RTAs is that you really can't compare them to drop in tanks . I like both types of tank, but I don't expect them to perform exactly similarly.
The Kabukis (in my experience) are also really reliable, excellently constructed drop in tanks. Mine haven't given me a minute of grief, ever, and they are super consistent. The price is certainly high, but one also does have to consider that they are US made tanks with a lifetime warranty. So, part of what you "pay" for is the willingness to support a manufacturer who really decided "I am going to develop the best 'flavor' tank for the nautilus coils," and then went out and did so.
With that said, I think there are times we outgrow a "favorite" tank. I quit using the Nautilus 2 and will be forever grateful for that tank but I don't really vape it any more. Etc. Some tanks, I will ake out of rotation, so I can return to them with a fresh "palate" so to speak.
But, if you've fallen in love with RTAs and feel you will 'never" vape the tank (or at least not two of them) you could certainly sell one. They hold their value fairly well to a certain extent).
Best of luck,
Anna