The kits are nice to start with, but if you know what you are doing, you can just read a recipe and buy what you need. Maybe tweak the recipe if you like. I am pretty sure that buying grain from the buckets at the LHBS is going to be cheaper than buying a prepackaged kit. But, some people just want to grab a box and brew beer.
The cost of brewing is roughly like:
Bulk Extract ingredients purchase
All Grain Kit
Bulk All Grain ingredients purchase
Group Buy Grain
From costs most to costs less. I cut my spending on ingredients in half by going AG and buying sacks of grain and hops by the pound (and growing some).
Day after day, it reappears. Night after night my heartbeat shows the fear. Ghosts appear and fade away. Come back another day.