You don't count servers for more people as a cost? IIRC one of the reasons for two main arenas awhile back was that one large arena was much more expensive than two smaller ones, the current size of LW being a compromise between prime time numbers and playability at more silent times. There's also administrative costs, someone has to keep record of players, their accounts and other similar things. The freebies will also join this forum causing possible need for moderating their posts. Rosie and Skuzzy don't work for free and I believe they wouldn't like to do extra hours either.
But all the administration they would have to do is being done anyway, every day with every player. You could possible put a $ value on the cost of an individual player, but in the big (and rapidly reducing) scheme of things I doubt it would add up to very much more than a couple of cents.
I also doubt that a few more guys posting on the forums and having to be moderated would result in countless hours of workload for HTC. At the very least it may prove they are sufficiently interested to stay and eventually end up paying a sub, a payment that of course would hitherto have been lining the sky rockets of WT and the like.
The simple fact is that AH is extremely difficult to learn. This, I believe, is predominantly due to the fact that there is no form of aptitude test to complete before leaping into the MA, and then

as to why you get incessantly murdered, at least when you aren't lawndarting.
It takes much longer than 2 weeks to get someone up to being able to take off and land, never mind engage in complicated acm.
If the trial period is to remain at the 2 week mark, then there has to be a system whereby new and untried players are taught the very basics of control, in aircraft, gv's and boats.
The number of times, and recently I might add, where i have seen "how do I take off" pop up on the help channel, answered almost immediately by the ubiquitous "Alt F4". Hardly endearing to a guy contemplating spending $180 annually, plus the cost of stick, throttle, rudder pedals, upgraded PC and so on
