Great point. I hate to admit it, but I really had not noticed that the boost time went to 4 hours after the sale ended. I guess I missed the memo on the 85% reduction you mention. I just saw that the price went to 20 gems and sort of stopped there.
As a practical matter, there really is not a meaningful difference between 1 gem and 3.75 gems for a 45 minute boost. Both are so low that the monetary cost is negligible. From that perspective, I would surmise that SC already determined that lowering the cost of the boost makes economic sense.
That said, there is a big difference between 3.75 gems and 20. And a big difference between 45 minutes and 4 hours. I rarely play the game for 4 hours. 45 minutes seemed about right. I would not use the 4-hour boost that often but would use an hour boost at the same rate often.
Much of what I want could be achieved by changing it from 20 gems for 4 hours to 5 gems for an hour. I do still think that there was a magic to the 1-gem boost because it almost forced me to buy gems for it, and I am not sure that the same would be true of a 5 gem boost. A 5-gem boost is also going to leave fewer leftover gems, which leaved me less tempted to use them to finish an upgrade.
It may be that the 1-gem boost allowed people to just use gems from clearing instead of buying them, and I am sure that SC ran those numbers. But it never did me any good to boost one of my barracks. I boosted them all.
Give me a one-hour boost for 5 or fewer gems, and I will find myself buying gems again. I may play for 4 hours and spend the 20 gems, but it won't fell that way.




