Make boxed cake taste like it came from a bakery

Did anyone ever try this trick on how to make boxed cake taste like it came from a bakery?

Step 1: Look at the directions on the cake mix
Step 2: Add one more egg (or add 2 if you want it to be very rich
Step 3: Use melted butter instead of oil and double the amount
Step 4: Instead of water, use milk.
Step 5: Mix well and bake for the time recommended on the box.