One of the points is that she shouldn't even get NPC wealth. As a summoned/called monster, by default her 'wealth' is whatever she can buy with the Treasure line of her monster entry. If she has greater-than-average wealth, like a true cohort NPC would, and one serving for a duration far longer than Planar Binding normally permits (specifically, 2,346x as long) there would need to be a price paid, such as the feat slot for Leadership that you're effectively substituting a single spell slot for.<br/><br/>Between the bonus wealth and the extended service, you're effectively getting a free feat - and not just any feat, but the single most powerful feat ever written for 3.5 (the followers are bupkis and junk, no one ever pays attention to them). That is what people are really upset about, I think....