Season series gold unlock amount decrease with time

Seems crazy that the 150 gold to unlock a season series at 8 hours is still 150 gold with seconds left.
There are 480 minutes between each series, making the value of 1 gold every 3.2 minutes . If the gold decreased every 16 minutes by 5 gold, it would be a lot more attractive with an hour to go spending a little gold to play the next series. Especially when you are in the playoff rounds and you want to get through them to get the rewards.
I would likely spend 15 or 20 gold with an hour left to start the next series than I would 150 gold. Or 5 gold with 16 or less minutes left. Etc.
I am no coder or developer, but I have seen this done in other games. Seems it would make sense for this section of TSB18.