Corporation problems?

So I started a corporation because i heard my campy will not de spawn if i do, is this correct?. When you start a Corporation instead of a company, it creates a separate bank account with the 100k seed money you put in.

When you buy any contract as a corporation owner it takes the money from your corporation account. and it doesn't put any money back into the corporation account on contract completion. This depletes the corp. account very fast and soon you cant buy more contracts. Is this intended or a bug? I gave up owning a corporation because it takes away from big money contracts. It should at least put the cost of the contract back in corp. account.