Could I get a more precise definition of whether a project needs a commercial vs. a personal licence?
What does a website need to require commercial?
I would probably buy a commercial license in this case. Is it a personal website? Probably not. Then it’s a commercial one, as I see it.
Maybe the website does not sell anything, but it may be a good commercial for the company that generates money later.
Kirby is at a lower price today and tomorrow so you can save some money to buy it now.
Check out this post, it has been discussed several times: Which license is for which purpose?
Basically, there are hardly any websites that qualify as personal, something like a hobbyist site or maybe even a CV.
Everything else that has the intention of finding customers - even if not directly selling anything - can be regarded as commercial, as well as website that display ads.
Thanks for the clarification @texnixe. I’ll mark this as solved. Maybe worth editing the “Buy” section of the website to avoid the confusion?
I have created an issue on GitHub.
BTW: I’d regard http://www.unanailleurs.com as a personal website (can’t see anything commercial or business-like in it).
And it’s running a personal licence so we’re all good on that front 
. I was asking the question for future projects and will probably end up buying a handful of licences to take advantage of the sale! BTW, is that going to be a recurring sale for every release or is it just to say sorry for taking so long to release 2.3? 
We can’t promise that yet. Better buy the licenses now.
Kirby 2.2.3 came with a discount as well, Kirby 2.2 did not; sometimes there are discounts at holiday times. So you can’t count on it but there’s always a chance, a bit like playing lottery …