This thread is talking about spending feats to essentially get total concealment at-will. That's bad.
You are talking about spending feats to ensure your effects can't get negated. You can't multi-class that number of times to get the option above, so you can't do it. That's good.
In general, it is a good idea to not hang back. It essentially gives the option above - either the DM tries to pick on you or the DM ignores you. Just with a little more clarity - ideally, you move in and out as necessary - giving your Defender a flank as an example and provoking an OA so as to trigger his mark punishment once a combat, then next round, shift away and shoot.
