You obviously cant price a bike at $99 then, if its assembled by an actual mechanic. Also, at the 2 shops I frequent, many bikes arent assembled by a mechanic. They are assembled by seasonal employees who know what they are doing, and then checked over by one of the mechanics. Just sayin.

But in the end, you dont need to be a trained mechanic to properly assemble a walmart bike. Just like you dont need to be a master carpenter to build a couch from walmart. You dont need to be a certified plumber to replace a drain catch from walmart.
People assemble cribs, electronics, basketball hoops, car seats, furniture, and more from walmart. Its just interesting that bikes are an item which apparently has to be fully assembled in order to attract buyers.