Unless something is absolutely tremendously bugged in something dropping high plat value vendorable gear in mass that should not, and was ony recently discovered - I can't see the normal drops, even if x4 more than normal causing this. Yes, this is the first expansion where many spells/tomes drop that sell for up to 2k to merchants. The height of vendorable plat items is SoF, where zones like Fortress Mechanatos and Gyro Spire Beta/Zeka have clockworks that not only drop tons of spells/tomes but tons of other scraps that sell to vendors for mass amounts.
To give you an idea of the actual amount of plat you can get killing and vendoring in these zones, a couple years back I used to mass train/clear these 3 zones with my live 115 raid geared paladin. I would clear all 3 zones twice over in about an hour time and every hour I would make about 50kpp in vendorable items (probably well over 1000 mobs killed). That said, to get these giant 100,000,000pp numbers - you would need to clear all of these 3 zones, 24 hours a day 7 days a week for 3 months straight to hit this mark. This is using a live raid geared character as well that could probably spew out more dps then every raider on Mischief combined to put in perspective (for those not aware of how powerful characters are on live, if you took every raid mob in TSS and put them on a raid geared live character, they would all drop in under 30 seconds).
I just don't buy this massive insurge coming from new plat vendorable gear. TSS has been out for close to 2 months now and the spike happened just in the last week while the other 6 weeks saw almost no fluctuation of krono prices whatsoever.