Hmm, I'm not 100% sure I agree with your logic on this one, although I'm happy to submit to your logic in 99% of situations.
I am glad I asked though as knowing the information that I can move inside the tooltip and back out closes it. Being a long term user I would have thought I'd have noticed that before. I haven't so probably others may also not have noticed.
https://goo.gl/GfZpNT
So given neither group is happy, why don't we look at some other options, rather than saying, you can't please all of the people, why don't we try to, or at least try to please more than 50%. I say we, I mean I suggest ideas, and you tell me whether they can work or not and implement them.
I agree that tooltips you can't click on are quite annoying, I've seen many a tooltip with a link inside it that you can't click on. A frustrating experience; made more frustrating by the fact inspect element > hover doesn't help as they are often triggered by JS.
Is there a way you could put a link to copy the text (or a button) within the tooltip? In fact, if you can do that, then surely you can copy the text. So scrap that idea. How about the tooltip does not disappear if you are hovered on it, but after you mouse out of a tooltip, it closes after a second (or x seconds). Is that achievable?