The skimmer debate isn't as simple as yes or no. You need to look at tank size and what species you plan on keeping.
Can you keep a successful Fish Only without a smimmer? Yes.
Can you keep and successful nano reef without a skimmer? Yes.
Can you keep a mixed reef without a skimmer? Depending on size, Yes and No
Can you keep SPS without a skimmer? Depending on tank size, Maybe...but I wouldn't have the patience to try.
That being said, I have a 150 gallon that I skim the hell out of, and a nano that I run skimmerless and filterless.
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