Its a great Idea. The block and pan are different metals. The copper one bas been the longest "in-use" for Brittish cars (which are...in my mind, garbage. No offense!), but is extremely effective.
The motor oil has a 'nominal' static charge. This charge, when not correctly diffused (i.e. through copper-coat) will, in time cause leaks. Hate to sound like a nerd, but the stuff works. All metals react with other dissimilar metals (i.e. steel&aluminum or steel&magnesium, or aluminum/steel). Its basic Chemistry guys. Now that we know that certian metals react in different ways with others, we know to apply these different sealants (silocone based and impregnated with other materials...) to keep our lubricants where they belong.
GL (Good Luck) and stay thirsty.