back in AD&D times, that was true. But in 3.X and Pathfinder, one can make a "use activated" item, that operates every time a command word is said. Sure such a Hero's Feast item would cost 132,000 gold, but it can cast a hero's Feast 600 times an hour, feeding 6,600 people. Charge one silver per person, and it makes it's cost back in 200 hours of use. Or you can be cheap and spend 30,000 gold, and make a Create Food and Water item that could feed 14,400 people a day. At 1 copper piece per person, that makes its costs back as soon as 210 days. Scary, right?

Now consider the same with a True Resurrection spell.

And oh yeah, I see some peasant writing "Wizard's on the Moon".