This is why endless wish tricks require calling, not summoning, efreetis. Binders being T2 with the summoning vestige is because they can easily have many creatures up at all times, with a huge variety of abilities ready to go at a moment's notice (or, at most, 5 rounds notice). This means stuff like endless healing, any movement mode needed, all varieties of detection... pretty much anything you might need. Plus there's the vestige that lets Binders make magic items all they want, and that leads to all kinds of fun.
JaronK
With regards to "many creatures at all times", it's important to note that the designer clarified in a later post on the Wizards boards that the power is intended to have a duration of 1 round/EBL, so you don't get the Hound Archon Army that initial literal readings of the power led to. This doesn't make the power any less versatile and you can still always have at least one creature (more depending on level) but it's not a pocket army.
the problem with that is unless its released under an errata or some form of offical pubslish, it doesnt change that by raw it can be used either way, it may have been idk as i dont tend to have players or myself try to abuse the system into oblivion.
i had a question however reguarding an earlier character build, which would still require the use of another party member, but not a teir 1 or 2. now Dread necro is my fav class hands down, the things you can get away with are just silly while not game breaking (ever use a giant zombie burrower to make an underground bus? or hide in the chest of a giant skelly let him grapple and make touch atks?) this regaurds the pot throwing rouge. now many times ive had the ability to have a legion of undead with little use for them, since dm's tend to shy away from letting me have them do much, but one thing they do alot is gather resources. while i dont think you could make the thousands needed, could you not have them gather, and with the right undead, make the potions for you? if you can ball park a few hundred skellies to gather supplies and some better undead to actually make them, even if the lab blows up, what are you out? two days of undead raiseing tops? it still doesnt help the build any for the rouge requireing another class, but it is more viable then trying to dodge creation rules with a wizard, although just as likly banned by a dm.
im not asking in a deffencive messure, more or less as a general curiosity for possible future game involving party members that rely on massive resource needs.