They require worship, reverence, and effort, though.
Now, sorcerers, on the other hand, were born with their power, and they automatically know everything they can do, somehow having the knowledge that dancing the Macarena while singing "I'm a Little Teapot," and throwing bat poo will somehowconjureevocationate a fireball spell.
Of course, that requires sorcerers to gather bat poo, as well as all the effort it takes to dance and sing like a moron.
Wilders, though, just get really mad and frowny-face the world into submission and become extra powerful through the power of sulking. In fact, they don't need to do the frowny-face thing, since their powers don't require any somatic components; it just tends to happen regardless. No study, no dancing or singing, and no running around collecting random types of poo to throw at enemies. Oh, and no throwing poo, either, or worrying about procuring a holy symbol. They were just born "special" (in both senses of the word). Granted, psions are vastly superior in pretty much every way, since wilders are basically an NPC class, but you said "laziest," not "best."