Progression of plat based rush costs

[(XBOX)Gamehowitzer]

So I'm sure many many players have noticed how as the item you are waiting on is building, the rush cost does not decrease proportionately. Hell I have an hour and a half left on my banshee chassis at this moment, and it still costs 25 platinum to rush it. Is there a reason why this was designed this way or has no-one brought it to your attention? For a game that has been going on for 5 years you'd think someone would have made an issue of it. So I ask. Why does the rush cost not decrease proportionately with the timer? Why does it cost half the platinum at the end that it did in the beginning? 

[More-L]

Actually, rush costs never used to have any scaling on them at all, now I believe the cost goes down at the half-way point (or something similar) A formula the wiki shows is Rush cost = Initial rush cost × (1 - ((Progress - 50) / 100))

[(XBOX)Gamehowitzer]

Right but it's still not (Imo) done right. Sure maybe the rush cost scaling is "better than it used to be" but it's still bad is the point I was trying to make.