I would like to buy Bitcoin with cash, but I don't know anyone irl, who has Bitcoin and could sell me some. Bitinstant would let you buy it for cash through Walmart/CVS/other stores cash deposit, but it doesn't exist anymore. And Bitcoin price on eBay is just ridiculous.
I think more than 30% of the people here buys their btc in cash
might be a little hard to buy with cash if a country does not have a community of bitcoin, but cryptocurrency continues to grow in many countries.