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What you're proposing is effectively "I wish for infinite wishes", which is never allowed. Furthermore, the laws of magic make it so that the good and bad of a wish are equal. Trying to make everything perfect is likely to cause the exact opposite to happen.
That, and the power of the wish comes from earnest intentions. Madoka trying to cheat the system wouldn't be as potent or powerful as acting on her feelings and sincere desires.
As for useless, well, speak for yourself. She gives Magical Girls an afterlife, a chance to undo their contracts retroactively if they weren't satisfied, and makes it so that girls don't become monsters that undo everything they previously worked for.
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