No, I mean like a 2nd level paladin with a wand of Cure Light Wounds. A paladin can't normally cast that spell until level 6th level (assume a Wis of 10).
Wands of Cure Light are relatively cheap. They only cost 750gp, since they're a first level spell. Then the paladin can cast 50 shots of a spell he won't otherwise be able to cast until 6th level.
A wizard can cast Fireballs at 6th level, and a wand of fireballs costs 11,250gp. A first or second level wizard will never be able to afford that.
If you have no problem giving a 1st level paladin the ability to do things he can normally do at 6th level for 750gp, why not let the wizard have some 6th level abilities for the same price?