There are already people here with stronghold months accrued by preorders. Too bad those points can't be used together:
"However, players cannot pool accrued time through preorders for server rental"
Server rental Q&A
But of course it would be a good idea to gather food and supplies! And a good place to play with zombies too!
If pricing is near to Battlefield
, then it would be about 25$ a month, 70$ for 3 months. Althou they said that it depends on the player size too.