can't you like take the Eco out of 'Tax' ballance?
You have to understand this is Mcmmo that made the exp like this. and understand 1 lvl is the same as 10 lvl in previous mcmmo. it feels more grindy cause its has all been reworked i had the same with Repair, but its just because what i litteraly said.
You can not rent a shop longer then a amount of days i think this amount is about 20 ich? So you don't have to worry about it beeing there for months, it won't stick for a month.
I agree with Saturnity, Its a daily reward so you have to log on each day to get it, if we reduce times = more keys and thats not something we want, there is enough keys that you can get, you can get 5each in daily if you have all the key upgrades, then you can vote also more keys, then Mobarena Even more keys so i don't see the point to add something like this.
If i am correct this has been reported already, and it is not such big of a deal cause its only a 1time deal because you bought the next perk.