That's not true... because it still takes people. Their salaries are higher. The cost of equipment is higher. Federal regulations have added cost. Production equipment sitting on the well costs more. And on and on. You can't say it only costs more to drill because oil is more difficult to find. That's just not accurate.
And yes, the cost of drilling has gone up dramatically in the last 2 years because of a shortage of engineers, equipment, etc. But smoothed out over the long term (we are in a bubble now), I stand by my statement that it costs less to drill now than it did before.