OPs question is what i'm asking myself for a couple of days now and i've found no reasonable explanation yet, besides "BC is teh future!". 
Exchange rate is fluctuating extremely and is too easily influenced by lots of factors right now, which makes it a pure gamble to accept bitcoins for goods that you've payed real money for, imho.
Bitcoin exchange rate needs to be somewhat stable, before i'd personaly would accept them as a payment option. You never know what they will be worth the next hour/day.
Playing around with the money on the exchanges is something for banksters, not merchants. At the end, as a merchant, you've payed real money for the goods you sell and you have real bills to pay.
What am i missing?
Exchange rate is fluctuating extremely and is too easily influenced by lots of factors right now, which makes it a pure gamble to accept bitcoins for goods that you've payed real money for, imho.
Bitcoin exchange rate needs to be somewhat stable, before i'd personaly would accept them as a payment option. You never know what they will be worth the next hour/day.
Playing around with the money on the exchanges is something for banksters, not merchants. At the end, as a merchant, you've payed real money for the goods you sell and you have real bills to pay.
What am i missing?
The price has been volitile as of late do to the massive influx of new users, like yourself, who only recently discovered Bitcoin. Only some of those new users are going to be concerned about buying a few bitcoin now, but enough that with a market as thin as Bitcoin is at present, that's enough to move it quite a bit. There are vendors who accept Bitcoin, however, by using a price update script that takes the 24 hour weighted average price from bitcoinwatch.com and changing their prices automaticly one or more times per day. Those who are concerned about the voltility of bitcoins can then sell those same coins on MtGox automaticly at that same price almost immediately by using their MtGox business account to produce their bitcoin addresses. Most vendors have started out in Bitcoin by selling all or part of their received bitcoin immediately in this fashion, but most move to the point of accumulation of Bitcoins.