Blizzard selling items with stats

So back when wow started, even in tbc there was nothing to buy with real money.
Now we got. Any reasons why not in tbc and why now?

Technology? I doubt blizzard didn`t had the knowledge to build an online store + in game pet/mount delivery.

If blizzard will add items with stats (gear, stuff to keep in inventory and get a bonus in stamina, etc) will you buy that too?