Actually, not to be difficult, but the opposite is true. Free Wi-Fi is becoming more and more scarce (at least here in the San Francisco Bay Area) because people will come into a coffee shop, plug in their laptop, and sit there for the entire day doing their work, surfing, whatever... and pay for only one cup of coffee. The power utilized by that person costs the coffee shop more than the one cup of coffee, not to mention that it detracts other customers because of the lack of seating.
There's a great article about it here:
http://www.sfgate.com/cgi-bin/article.cgi?file=/c/a/2007/03/11/MNGKKOCBA645.DTL
Same thing is happening in my area. Coffee shops that once proudly boasted free wi-fi have now shut it out completely. I guess they can't figure out how to charge for it so they just shut it down.