The frequency of getting that last candy tile on the wheel is likely because there's a 50% chance to get candy and whenever you DO get it, it just displays as that last tile.
I mean, when was the last time anyone got 5 candies from any of the other tiles? The most likely explanation is that the game just shows that last candy tile whenever you get 5 candies.
Half the tiles are candies (not including the super-rare emblem tile) so the game's likely just programmed as "50% chance to get a candy. If person gets a candy, display the wheel landing on that last candy tile".
Well the main reason I have so much metal is that I have so little of everything else.
No real candy income means that I rarely need to use that last big 12,800 and 25,600 stat increase, in fact I have only done it once and are about to do it again soon. The main reason is that I have levels all my important 4-5* girls that i'm using to affecting level 2 so 30 x 15 = 450 candy for that instead of 3 girls to max lvl 5. The reason is that it was cheaper on metal and candy for the rewards.
My gold goes to the factory and emblems so I don't have enough to repair, upping my emblems has been the only way I could proceed higher right now, the XP grind is quite hard in this game.
Metal is that one resource that I have little use for. The small amount used for factory is nothing really and repairs cost too much gold to bother doing, also PoC not needing repairs means that the best way to farm XP right now is PoC as high as you can go then back to easy missions to complete dailies. Based on that I only need to use metal once a week when PoC resets and I get some decent candy, since I get 1500 each major gather and a fair amount from 15 hr scouting runs, it builds up fast.
Flower Knight Girl: 255445855
Most people don't have much use for metal (the one exception I found so far is a player that just spams repair all the time, which almost no one else does)
Its even worse in the mobile version where candies don't exist (and thus metal for relationship points). Some people have like, 300k+ metal over there.
I personally am using my metal only slightly slower than I'm gaining it myself though. I guess being in the top 0-1.999% every PoC week for candies (and having the tanks to use those candies on) seems to be the equalization point.
I myself am in the 0-1% category pretty much every week and don't have sufficient metal to max my tanks, though I tend to get all 5 scenes on a tank before moving on, so I'm very different from Zandel in that regard (especially since about half my team doesn't have scenes) so with the super-expensive last two, it's understandable
is lvl 35+ maps getting pretty difficult for anyone else? i fail them the majority of times. usually it's because the enemy pulls some kind of long range unit that kills my heavy in 3-4 hits, then my formation gets destroyed.