People say that some plants make pitchers/ better pitchers when the tendril rests in Sphagnum. I don't believe it's because of light, because otherwise N. argentii would not make the majority of it's pitchers, and N. sibuyanensis is known to have white, light-starved pitchers buried in the substrate in the wild. I believe its because of higher humidity. Notice that it just so happens to be that the species that are known as "pot resters" are also known for their high humidity requirements. The two examples of N. sibuyanensis and N. argentii are the two most epitomical plants that are reported for this, especially the former.
Regardless of Ron's view Vs. my view on why this happens (Ron will argue with a wall
I'm kidding, Ron
), the fact that it HAS to be resting on something is a load of crap, and you should know what you're talking about before you start giving advice. You HAVE been spreading a lot of mis-information. If you would work on your English skills, it would make it a lot easier for people to read your posts. Try saying your 50 word sentence out loud, without including any pauses for punctuation; it doesn't sound as you intended, does it? Put a little more effort and TIME, into your posts, proof read, and people will respect you more and be more apt to heed your advice... providing it's correct. Another tip is to download a free add-on for your browser that will spell check for you automatically. EVERY man, woman, and child should have one. I don't mean to be coming down on you, but this has been going on for quite some time and it's getting ridiculous.
I have never grown N. sibuyanensis or N. argentii, but I have grown N. 'Jungle Bells'. The pitchers it produced when resting on live Sphagnum were small (could have help 3-4 milliliters) and juvenile. Then it popped out pitcher that could have easily held 15 or 20 milliliters that was very defined. This pitcher developed while hanging and not resting on anything. The pitcher after that was resting in live LFS. It could have help 5 or 6 milliliters. In all other plants that I have ever grown, there has been no difference between pitchers produced on Sphagnum, or pitchers hanging (or resting on something other that media, like egg crate) . As a disclaimer, I have very high humidity. 80-95%
EDIT:
As an afterthought, D_Muscipula, look up N. sibuyanenesis uppers sometime