1:
1 player uses 5 characters means that you can have less unique players online at the same time on the server, lets say your limit is 5, 1 decides to multibox 5 accounts. 4 others 5 minutes later want to enter the server but it is full, it means that less unique players can be online at the same time if too many multibox. no-matter the limit there will be times when the cap is reached and i cannot see how it should be justified that 1 player reserves 2-40 spots or for himself just to have an unfair advantage rather than allowing a unique new player to join.
There is no player limit at the moment. Twinstar's wotlk servers can support up to 3000 players (from what I've seen). No reason to limit online alts.
2:
multiboxer's can host their own battlegrounds late at night at win feed his accounts, thereby messing with the pvp system. and nomatter how much you watch them at night they will find days months after the release when you have better to do than constantly whatch it and that is when some either uses this a lot or from time to time does it to make it seem smooth, and for every character it reserves a spot on the standing that other honest players should have had.
You said yourself that multiboxing in pvp is banned, mainly as a rule copied from blizzard. If multiboxers can't pvp while multiboxing, this is out of the question. Not to mention that honor trading is part of the List of Violations too, so you only need to catch him once.
3:
multiboxers farm faster and safer than single player's so earning gold will go many times faster for them especially once they hit 60, so all who want to compete in progress are forced to join the multibox train.
I am not convinced about that.
4:
camping: you can place your accounts on every black-lotus or other value-able spawn and camp it knowing you get all the gold or control on that item on the auction as long as you are awake and therefore can decide the price you want the longer you stay awake.
You cannot camp black lotuses, because they spawn somewhere else on every respawn.
Even if they did spawn on the same place, you can camp them with your alts too, you don't need to be multiboxing. Hell, you don't even need another account, you can simply relog at the right time. It's your time you spend being awake, I see no problem.
5:
you can ignore bank cost since you can just make limitless amount of alt's that you can trade it to or from and get more bank slots than if you paid for extra. you can even ignore travel cost with a mage and warlock, have a warlock in every city with 2 low levels and summon you to where you want to be or portal from capitals without needing another mages assistance.
"Normal" player surely can't do the same thing, right?
If you don't like alts, then don't level them and deal with it! I never had any high level alts and It worked fairly well for me.
6:
you can kill a low lvl and plant 1 of your accounts to watch, he wont resurrect seeing you there even if you arent even watching that account but just afk on it to annoy and mess with him... this is likely to make a new player leave the server for good, he wont be using forum or such since he is new and even old players leave rather than trying to proove what happened.
Again, "normal" player surely can't do the same thing, right?
7:
blizzard had a cost on each account without discount for multiboxers for another good reason: free multi-box easily get's out of hand. it starts with being invissible but later on more and more pick it and more decide to find the limit before a GM is involved.
If I understand correctly, just because some huge gaming company has paid to play accounts, we should limit/ban people from playing multiple characters?
That's as if you said that Pokemon battles are one on one and that's why you can't shoot two wands at once.
8:
trolling, if you multibox you can act as if you where multiple random people when whispering someone or debating and turn the masses in your favor making them think others think the same
Again, "normal" player surely can't do the same thing, right?
note: i know you can fear a multiboxer and he will only have 1 to control at a time, but if you have 1 lvl 60 vs 5 you can only kill 1-2 at a time and he can without care swap to another upon death untill you die and use 1 of the last to ressurect... if you want it to be "blizzlike" then there needs to be some sort of restriction on it since it no-longer has a high cost.
I killed 4 different people with my paladin back on Kronos and they were all attacking at the same time :wink:
"Blizzlike" has nothing to do with or against people wanting to play more characters. This sounds more like a paranoia without any real base for your fears.
Sorry, I definitely won't be looking to the worst failure of a server out there for an example.