Cheap and consistant feed is certainly a competitive advantage. Close grazing is also a big plus. Attracting investors will be difficult unless you have a track record at running some yards. You can usually buy a yard for less than the build cost. Most yards in the beef belt began as good farms with extra feed. I figure a feedyard slot is worth about $50/head for 1 time capacity - you might turn tthis slot 3 times if you line out on grass.
Right now, steam flaked corn isn't enough more efficient to justify the extra expense. High moisture ensiled corn is a great feed resource.
Run off management is necessary, but not such a big deal on the right locations. The old time honored tradition of citing a feedyard next to a creek on a steep hill is history and should have never been done.
You'll need more water than you think, and all weather road access really matters.