I'll try and find the link if I have a chance later but on the zeo forum an overksimming thread digressed into a chemistry conversation on wet vs. dry. For the sps keepers, overskimming wet was argued to be a very bad idea. Overskimming dry however, not bad.
The jist is that;
when overskimming you hit a point of efficiency, whereby everything that your skimmer can remove has been removed. No further DOC will be pulled, however trace elements will still come out most notably K. Unless you are ill with the 10% weekly water changes you will start down the road of trace element imbalance. How long it will take for that imbalance to get to proportions that will be detrimental depends. It could be weeks, months, maybe a year or so but you will get there.
When skimming dry you're not stripping the water as much of these elements. As Herm mentioned, and yes his word should be enough
, you will get more wet than dry but you don't necessarily want to pull out the extra stuff.
Disclaimer: I am no chemist, in fact I didn't even do well in chemistry. All of the above was paraphrased from an article I read.
holla