I think most people probably get enough antioxidants and indoles like DIM in their diet; because I've had most of my colon removed, my diet is necessarily deficient in those things, so I take them in supplement form. I'm not sure, given the cost, that it's worth everyone taking DIM, but that's just my opinion. Of course your DR is the best judge of what's best for you.
Maybe I didn't explain clearly enough why I had to raise my estrogen dose. Prior to starting the DIM, I was using the Vivelle dot .075mg/day plus compounded testosterone 2-3 times a week (1%, just a small dab each time), plus OTC progesterone (a tiny dab nightly). I felt pretty balanced on that combination. A couple of weeks after I started the DIM, I started having symptoms of low estrogen as well as high testosterone - hot flashes, joint pain, irritability, oily skin - and when I increased my estrogen to the 0.1mg/day patch and cut way back on the testosterone, all the symptoms disappeared and I once again felt balanced.
Prior to starting the DIM, unbeknownst to me (who thought the only estrogen I was getting was from my patches, plus maybe a little production in that lovely belly fat we all seem to put on after this surgery), I was apparently converting some of my testosterone to estrogen. The DIM blocked that conversion, and without that contribution, my total estrogen dropped. My testosterone level rose since it was now all staying as testosterone.
Nowadays, I still feel pretty good on the Vivelle dot 0.1mg/day patch. I haven't used any testosterone in weeks, though I keep it around and occasionally use a little dab if I feel 'run down' (not often at all, though), as a booster. It really doesn't take me much testosterone at all to maintain my libido and energy while on the DIM, whereas I had to keep using it before.
I hope that makes it a little clearer. I've been very happy using the DIM, which was the only aromatase inhibitor I could tolerate. However, I worry sometimes that everyone will jump on it as the next great cure-all, prevent-all, and of course it's not that - nothing is, at least that we know of yet.