... The set designers on a bigger show are smart and courteous enough to put outlets in a wall, resulting in extremely convenient places to plug in lights and practicals.
On low budget shows, they do no such thing, resulting in the juicers having to run stingers everywhere and/or worry about how they're going to hide the cables. More often than not, the job requires the extensive use of zip cord* which, on a low budget job, there probably isn't much of anyway.
*Zip cord is also commonly known as "lamp cord." It's also, for whatever reason, "illegal" to use if you're on a Union show.