@Haka-Taka I agree with you.
My take is, everything is Vault Slots:
Workers, you can do fine with even 4, I got mine doing nothing for months at a time now, low level players should not worry about having more workers IMO, it will just get them faster to the point of needing to pay gems for Vault Slots which is not a good thing.
Extra Hatchery could work towards the same objective, having a plethora of monsters doesn't actually benefits you, you just need to have the right monsters for pvp, wars and some miners, clogging your habitats is only a way to again, need to pay gems for Vault slots, other than that it can be used to have an extra slot for breeding events, which can be benefitial for some us when trying to rank monsters, if you have the gems to speed up a little.
Gold Boost -MEH-
Food boost, ok, food, cool, for what? is the point, more food is actually only good for ranking relics for me now, given the fact of having relics to fodder, other than that having more food to feed monsters is only useful to a certain point, when you reach the cap you don't need more food for monsters unless you're buying Vault Slots.
So, for me, it would be paying to get faster to a point that I don't want to reach, Buying Vault Slots.