The bigger the labour pool, the worse deal you are going to get. You're now competing against the guy in Nowhere Town, this guy can do your job and he's willing to do it for less because he's never experienced an expensive reale estate market.
I run a small consulting practice. We are highly skilled and very experienced. We can often charge much less than our competitors because we don't have the overheads our competitors do. A 1 million dollar deal for my practice is worth a lot more than a 1 million dollar deal for Accenture. We can go down to 700,000 and still have over 90% profitability, Accenture will walk away at that price point because it's not worth their time.