I really didn't think it was hard to find the $50 digital download on Amazon and the Ubisoft store. Took all of one minute.
But yes, Ubisoft does want you to buy the $60 version. If they didn't, they wouldn't have made it. Same thing applies to every other game these days since they all have deluxe editions, as well as pre-order bonuses. FC3's deluxe edition is cheaper than the norm, since most cost $70+.