I honestly just thought it was mainly the fact that Paramite's have a single toe one each foot; it's hardly climbing a sheer face of rock. Even if it did have more suitable feet, it's weight might caused problems.
Yes, the webs would likely be too draining on the Paramite unless they were in their area of permanent residence, considering how thick they are in proportion to the Paramites (which is necessity over the thickness of spider silk, for the same reason of weight issues). Also since the other members of their colony would be able to utilise them regularly, as opposed to a one off use for a scouting individual.
Obviously the *real* reason is simply that it hadn't been invented/utilised as part of gameplay. Only when you possess a Paramite can it climb webs, and this is of course impossible in AO.
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