Baggage Fees, but Free Wifi?

After getting on a plane at MCO this afternoon, I realized something was rather amiss at Delta Airlines, and I imagine a lot of other airlines have this strange incongruity, as well.


Delta Airlines has a $25 baggage fee for each bag checked at the terminal, but the plane I stepped on had free wifi for the entire flight.


My only question is: What?


While I certainly won't complain about free wifi, which allowed me to play my favorite text-based MUD in flight (Threshold), it still struck me as a completely ludicrous incongruity. Why would they charge $25 for a baggage fee, but could've easily charged for 30 minute increments for their wifi?


I know this isn't my normal posting grounds (considering it is not at all gaming related) but I had to sound off on this just for the sheer mystification I found when I paid the $25 baggage fee (a rip-off, and they're still the lowest price for said fee). 


Either way, airline travel is getting harder and harder to enjoy.