I think you can run a tank just fine without a skimmer. However once you get into the bigger tanks a skimmer is almost a necessity, due to the amount of time and money required to due major upkeep all the time. My total system volume nears 250 gallons and I would not like changing 10-20% of this every week. If I was retired and didn't have much on the go, well I could manage that, but I'm not. I perfer doing less waterchanges and pulling oodles of junk out with my skimmer. I also think that the balance in my tank is better due to the fact that I'm always pulling out waste that is theoretically introduced as food everyday. It dosen't accumulate until my next water change.
Bev gets away with not skimming, but she's also on a very strict maintenance schedule that some people would have a hard time adhereing to.
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