I am still progressing through SoF and SoD zones, so I am quite content to pick and choose my gear upgrades from traders selling reasonably priced HoT-era drops. Reasonably priced to me means 2k - 4k for non-visible slots and jewelry. Thankfully I don't lust after incremental stat increases since I need to save plats for spells on my two toons.
Every time I check the bazaar to see what's for sale, I am floored by some of the asking prices - 20K, 40k, even 80k PP. Granted, these are typically for VoA-era items, but is it really that common for players to make that kind of platinum from adventuring in the later expansions?
Also, I often see items I buy for 2k - 4k PP being sold for 10k - 20k PP. I can't help but wonder if those traders ever sell their items. Are they just delusional, or is there really that much demand (i.e., players with that much platinum to spend on alts)?