It may SEEM cheaper to rent, but IMHO, over time then when you have built good engines you can then rent them out to OTHERS and make money..also, it is cheaper to build than rent in the long run.
) means you can make these engines yourself for much less, and as blade said you can also sell your engines to others which can cover the cost of the department.
)
.


think i can get a slightly lower price next year? 



