Up to a certain point. Most people don't understand what "top of the line" is. At any point, TOTL will be very expensive. If you were to get a TOTL rig, you're getting a dual-8 core Xeon with multiple K5000 graphics cards. Each of the processors cost $1800, and each of the graphics cards cost $1800. You're basically looking at over $14000 for a TOTL system.
Will it last? Why yes, yes it would. It can run 2160p, which is essentially future proof. Is it worth it to normal people? No. You can buy a car for that price. If you're a millionaire is it worth it? Why yes, yes it is. Buy back to your original question:
Do you save money? No.