They are expensive labor but still less than half the cost of a whole new logic board with CPU, RAM, NVMe, etc. Looking at something like $600 instead of $1200+. Plus with Apple's authorized solution you are guaranteed to lose all your data, whereas third-party repair shops that do board-level repairs may often be able to avoid data loss.
My friend and I both sent our MacBooks into Louis Rossmann the same week. He spilled a cup of water on his, mine just killed itself for no reason. The repairs were expensive but they managed to not lose any data, and it still saved us many hundreds of dollars each vs. doing an Apple-authorized repair.
