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Let me say that whoever thinks that the network engine is the most expensive part of a MMO is either a snake oil vendor, or genuinely deluded. Don't get me wrong, I'm not saying that it's trivial, but it pales in comparison with other money sinks and bug oportunities. E.g.,

- The sheer quantity of content there. Compare the surface of WoW, including instances, to, say, NWN2. And NWN2 was a long one. A SP game is meant to be played for 10 hours, maybe even 50 hours in some cases (e.g., NWN2), while a MMO is meant to be played for 6 months on the average. (That's about how long it takes for an average player to get bored anyway and quit. Mind you, like with all averages, some quit after a week, some stay for 6 years.) So you actually have to have content for all that time. Even if it gets more time sinks at the end, you have to, you know, still keep people there and excited by the time they get to the endgame grind, or they won't be goaded into it.

And while sheer terrain surface can be algorithmically generated, the next parts can't:

- Quests and scripting. A world which is just populated with hordes of respawning monsters to kill repeatedly, just doesn't cut it any more. You may find your 10,000 player niche that way, but you'll never be the next WoW. The aspect that the world is essentially a static one is a turn-off. It takes much work and scripting to get the player to suspend disbelief and believe "yay, I saved the elven girl" just as he watches the next group member standing in line to deliver the same cure again.

Ok, so it's not that bad, but you want the quests to be _interesting_, and _believable_, and make the players feel like they've discovered a bit of the story or background or whatever. Copy and paste, mass-produced quests... well, ask Sony how well that worked for EQ2.

- Balance. It's not just for Blizzard any more, folks. In a SP game it's less problem if everyone plays the Godmode class, though even there it _will_ piss off everyone who picked the Pussy class and can't even get to an enemy before being nuked. But in MP a game where everyone plays the same class is boring. Doubly so if it has PvP.

Worse yet, in SP you can give the player a known mix of party NPCs, so you can know what abilities combine with what other NPCs ability. In MP you can have (and _should_ have, because otherwise again it's uninteresting) all sorts of possibilities to combine the abilities of any two classes. Is there some uber combination you've never foreseen?

Are there some items which are horribly unbalanced? E.g., if, say, you give players an ice sword which applies a slow effect, what happens when 5 players with ice swords hack at the same NPC? Does it stack, effectively being able to freeze someone solid for as long as you wish? Does it stack with other slowing abilities, like a mage's Slow spell? If not, do your items make a class completely obsolete as the same spells and effects are available from items? Does it stack with, say, applying an ice oil to that sword? What is the trade-off if I use that sword, compared to another?

Basically, balance is more work than most companies realize or are willing to put in their game. But it makes a hell of a lot of difference.

- Support. If your whole game's premise and repeated business incentive is that it's a persistent world, and people should get attached to their possessions and character, then you'll have to deal with whatever unfair stuff happens to their character or their equipment. Don't underestimate the costs of that, because few things piss a player off at your game than falling in some hole and the understaffed support not answering for a week. And it's not only because of getting attached to that, but while in SP you'd just curse and reload a previous save, in a MMO you don't even have reload.

- General code quality. E.g., did you make sure that the game glitches don't double your support requests? E.g., if in a SP game it's possible to duplicatee items or money, well, (A) it doesn't affect anyone e