FV2CE Land Expansion Prices Revealed
The choice of waiting for the timer to count down is in each player's hands. I think that if a player is really hurting for space in their farm then skipping the timer is something to consider. The more breathing room on a farm the less chance of crashing your mobile device or that of your visitors. Plus, less chances of accidentally using up keys when trying to use your various machines.
A final note or two: Prices are subject to change depending on level/region/player usage of keys. Also, the key price is a sale. Once the sale is over the key price to skip the timer goes up substantially.