brushman,
Clearly there exists a whole lot of conditional responses. "On the one hand,...but on the other..."
It might be difficult to see what has evolved here, even in this thread, is that certain people have very specific experiences that support specific beliefs. If you're just starting out, and have what would generally be considered a nano, it might be completely appropriate to go skimmerless. Likewise, a skimmer on a 20 gal might only take money out of your wallet, or force you into decisions in the future (I have this skimmer, so my next tank should be no bigger than x gallons, to save money)
kharmajavah has an excellent point. Water changes are a successful strategy for him. Others here talk about $1/gal for salt at the LFS, but buying and mixing your own makes the "water change" strategy much more attractive financially.
The key is, you need nutrient export (generally speaking, and keeping jefathome's comments in mind). So whether you do it with water changes, skimming, or even macroalgae harvesting, or a combination of all of these, the important point is export in a maintainable way.
Nobody wants to look at the yellow box of water in 6 months and say, "Eh, just not what I had in mind."
HTHnutrient export