Store companions, store mounts, heirlooms and other stuff all started out as one-offs. But as every expansion stacked up, everything had to be up to date. Heirlooms are now a mandatory upgrade for every expansion, each expansion there's a new set of heirlooms with a higher level cap.
Seeing the amount of cash blizzard is stacking up since the boost-to-90 (wouldn't suprise me if they have made more than on any other expansion by now, i look around and most people buy 5+ boosts), will we see a boost-to-100 in the expansion after WoD?
Surely the intake was great, but will they expand their ideas to cash in more? Making it a small slippery slope towards a full-on blizzstore game? Or will they stay with the 90 boost and leave it there?