Have you stopped to consider that your Bits & Defiance store items are only good for the lifespan of the game?
All MMOs exist only aslong as their players and fanbase do so the situation for the game could change at any time.
At some point in the future, like all MMOs there may come a time that the Defiance servers close. If that were to happen, you would lose all access to any remaining Bits & Bit purchased items as currently the game is only available online on the servers that Trion provide.
There may come a time when Trion either choose to close the servers or are unable to fund the cost of running them. At this point, you would most likely not be compensated (even for Bits still on your account) and you would no longer have anything to show for the money you had invested in the game.
I'm not trying to put Defiance down or spread bad feeling towards it, thats the last thing I want. I just want people to consider what they do with their hard earned money.
And for anyone interested, personally I love Defiance & I have 1200 bits on my account at present.