From the questions you asked, it seems to me that you don't really have anything specific in mind to buy from taobao. If so, I don't think buying from taobao is a very good idea. There has been a few Poker and other random keycap group buy here, run by regular members here, or imsto or qtan. You are better off going with them first. People, like me, went to taobao only to find keyboards that were not available anywhere else, or somehow significantly cheaper even with oversea EMS shipping and agent commision. It is quite a hassle to buy from taobao through an agent, IMO. You have to really want that something you are looking to make it worth it. I went to taobao to find a white body tenkeyless Filco with red switches. At the time, no one and nowherelse I could get it from. It cost $270. And you can now get other white body Filcos cheaper from qtan.
If you have a keyboard in mind you want to buy, you want to ask obook to check to make sure there is a taobao seller with the item in stock. One bad thing about taobao is that sellers frequently list items that they don't have in stock. If you don't check first, you would have sent money to the agent for something they can't buy for you. And you would have paid for the exchange rate differences and money transfer fee for nothing.
Actually, obook's commission fee for electronics is about 24% which is higher than others. I used taobaobee as well and they are bout 9%.
In any case, if you should go with something more readily available, like Filco from keyboardco.com or Leopold from elitekeyboards.com. Or just buy local. You are Australia. Cactux and Laggy-gaga here on GH are both from where you are. They maybe able to give you advice on where to shop for keyboards locally or how to buy from overseas.
Good luck.