to make price predictions useful it takes years of holding onto CCUs sometimes. I have about 5 pages of 0CCus left i already used my biggest ones such as andromedia to bmm and bmm to carrack etc. when new ships come out i always buy a stable ship base(things that are already released or just increased in price) into the new ship. i aim for about 5-10 usd ccus then at the anniversary sale i'll refresh melt/buy everything i want to predict for the year rinse and repeat. sometimes i get lucky sometimes i dont I'm getting close to the end of my fleet that i'm buying with cash i might make 2 more total ships even though that other exploration pack is calling my name.... btw i think you forgot to attach your photo of your normal CCU.If you watch closely, my screens are not warbond CCU, but classic store credit CCU (bought with store credit).
And yes very old CCU have gone up in price, but not all the time (it seems random, some people have the increase, some dont, here it is not my case when i bought them back, none of my CCU has ever gone up in price), and the 0$ CCU were removed from buybacks (for most people, if not all) but not hangar (though i kept zero of those 0$ CCU in hangar, my regret hehe).
I never had the time before to stock up CCU on anniversary sales (never attended any before 2020), or other events, exept here and there over the years. But since last year i'm all in in that CCU thing hehe.