I can't see why TL insists on people paying almost $30 worth just to get a new slot to breed more animals except greed.
They make most of the animals take 18 hours now or more to breed and you can't do more than 1 in a whole day unless you pay 149 gems. Since $20 buys you a little over 100, it's about $30 worth just to buy a new slot.
Why not let us unlock new slots and - if people want more faster (which they always do if they can afford the expense) keep the extra slot but lower the ridiculous price.