I think that tangible experience would probably be more valuable than online experience, but I also suppose that it would depend upon the nature of a given interaction, I.E. if more stress is placed upon psychological control, than intangible experience would be valuable, whereas if more value is placed upon physical control, tangible experience is paramount.

From the standpoint of a relationship, I could see experience functioning as a double-edged sword. More experienced people may be less inclined to acquiesce to intimacy desires of others, dependent upon the rigidity of that particular individual's persona.

Then again, if you are incapable of compromising in a relationship, be it a D/s or what I've seen described as a "vanilla" romance, then you probably won't be in that relationship for long. For me, because I have certain control needs, I think of it from the standpoint of commerce, and the need for consistent equity between exchanging parties.

I am extremely new to this lifestyle, but I see this as an issue of applying thought schools appropriately. Both forms of experience have their place and venue, and both can be debilitating to achieving a desired end if plyed in excess. Someone let me know if I'm totally off base.
:-)