Why buy a clone? It usually comes down to money.
I can't say that I'm entirely innocent there. I have a fair amount of E3D clone parts around (Though both of my Duets are genuine. Or at least they were sold to me as such by authorised distributors. 🙂 ) It's all well and good to say that you're supporting development, but the reality of it all is that to the vast majority of purchasers out there, that's not worth a lot of money. It might be worth a little, but for the most part, people aren't buying this one in hopes that the next one will be that much more awesome. They'd probably just hold off and wait for that one. If the original company wants to keep making money, then their best bet is to stay ahead of the clones. I'm quite happy to see that the Duet is still moving forwards, and doing exactly that.
This doesn't look like it's going to be much cheaper. Well, maybe if you're local to the maker.
This is of course a problem when you make open source hardware, that there will be copycats that pop up. Hell with the Chinese factories, if they think they can make a profit, they're more than willing to reverse engineer something even if it isn't open source.
For my part, I've ordered some genuine E3D parts to replace some of my clone parts, hoping that the genuine parts will solve some issues that I'm having.
@elmoret : LOL. Yeah, I saw that 15A fuse too. Practically no point in it even being a fuse at that point. (I have a 15A fuse at my PSU, since that's what my PSU is rated for, so on my printer there's an approximately 0% chance of that fuse blowing.)