Value of glass depends on a lot of things. Rep of the blower, rarity, if the piece is still currently in production, etc, etc.
Not everything depreciates by a set amount. Think about art, a Van Gogh is worth much more now than in his lifetime. A spanish doubloon from a sunken pirate ship is worth more than the same doubloon found in the ground or a piece of gold at the same weight.
When you sell used pieces the price does not go down greatly. Or rather it depends on the piece. Some folks are able to sell their worked pieces for more than they bought them for. I bought a mothership fab egg for 1250 and sold it for 1200. I got a pillar for 1200 and sold it for 1100.
We're not talking about a wear item, ie the bong doesn't wear out like shoes. I know a bit about glass and brands and I buy used whenever I can. A lot of the stuff you see being sold and traded online is more higher end stuff. I rarely see SGW waffles on nuggetry but I've seen quite a few mothership pieces, toros, sov, coyle collabs, elbo dinos from time to time, erik anders recyclers, contrabassos etc.
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So basically what your saying is price depends on supply and demand. Are you seriously going to compare a van gogh and items from a sunken pirate ship to a modern, used water pipe? That's a bit of a stretch