I bought zero. Every outfit/mount i wanted I got from GTN. Those things aren't that rare / expensive. Nihilus' mask is already 1 million on my server, double-bladed saber is like 300k along with blasters and rifles. Only mount seems to keep up over 10 mil but i ibelieve it will change.
I just bought overpriced and bugged (it has two hoods!) Pathfinder set for the Coins and that's it. Keeping rest until the 6 week content release and new items. Maybe we'll see some robes asked for in the moddable outfitst thread