Heres how you do it. There are two large, know exploits atm. I'll explain both.
Bounty Contract/Rakghoul cylinder/gree helix exploit: You will need at least 2 of each of these to exploit. Go to the Cartel Bazaar on Fleet. Go to the event vendors that take these items in trade. Spend 2 BC's at the BC vendor ON A PICTURE DECO that costs 1. You should now have a stack of 2 in your inventory. Split that stack into 2 stacks of 1. Now you will notice that when you sell them back, they sell for 2 BC's each. Now when you sell them back, you have 4 BC's. You can do that repeat. To speed things up. Buy a stack of 99 of the 1 BC Picture deco. Each split of 1 off of the stack of 99 will sell back to the vendor for 99 contracts. The same method applies for all the event vendors. Presto! A Bazillion of each of the items in about 3 minutes time. Only the BC's are tradeable/sellable on GTN.
THE BIGGER EXPLOIT: You will need at least at LEAST 100 basic crystals for min exploit. 100 basics, 100 glowing and 100 radiant for MAX exploit.
Go to fleet in the Stronghold/deco section. Find the vendor that sells decos for crystals. Use the same method I described above for the event vendor. The min. cost for 2 decos will be 100 crystals (hence the min req). BUY THEM IN A STACK OF 2 (not 1, then 1 more). Split the stack in ur inv. sell back for 100 crystals each x2 = 200 crystals. Rinse repeat as much as you want. The result is: 1) you can gear your toon in complete 208/216/220 gear with infinite crystals. Once you have a 1000 basics, but a stack of 20 of the 50 basic crystal decos. Split off 1 and sell back to merchant to get all of your 100 basics back. Then take the remaining stack of 19 and head to Odessan. Go to the Rank 6 comp vendor. Now buy a stack of 33 comp gifts. Or if you like the alliance crates. Out of crystals now? No problem! Break off one of the decos you got in the stack of 19 and sell 1 back for another 1000 basics. Rinse repeat to obtain infinite comp gifts/alliance crates (or exotic element stabilizers if you bring some glowing crystal decos for restocking). Any questions?