Hi,
A new currency, tokens, has been introduced with the weekly challenges in order to upgrade pop buildings which are otherwise not upgradeable.
Already upgradeable buildings use logically existing resources. So far, so good.
Yet, for various reasons, it seems that the majority of players won't be trying weekly challenges in a long while again.
There are pros and cons about those challenges and some find the cons outragesouly outweighing the pros.
One way to perhaps interest those who already have a really decent amount of pop and who do not see it as beneficial to part with extraordinary amount of resources to only gain a relatively small amount of extra pop, would be to use those tokens in order to upgrade prod buildings to level 7 (and beyond)?
That could make those tokens a lot more coveted and tip the balance in favour of the weekly challenges.