As someone who has suffered through running small businesses more than once in my life, I wanted to add a bit of advice for the OP because it's hard and expensive to take that jump even as a side business. It involves a lot of failure and requires thick skin along with an irrational balance of ego and humility. Even trying is commendable. Take this for what it's worth - which is what you've paid for it.
As a technical matter, I can't say I have a dog in this fight. I've never used an Idod, and don't really see why I would want to. I've turned plenty of cases the normal way and it's always worked out fine. Personally I think what Jackie says makes a lot of sense and it matches my experience, but again, I've not used an Idod to compare it to. For F Class, I don't even bother turning brass anymore because I haven't found it makes enough of a difference to matter to me - my rifle shoots extremely well with unturned brass and I'm not losing any points because my brass isn't turned. I tend to shy away from expensive gear unless there is a quantifiable reason to spend the money. I use a partner press, mostly factory dies, and make bullets with a Lee press (really underrated presses, by the way). I don't anneal - not because it doesn't do anything, but because I have found it's not worth my time for my shooting. This is just how I am. Sometimes simple cheap stuff is better than complicated or expensive stuff.
But none of that matters, because I'm not your customer and I was never going to be. There are plenty of people who love idods, but don't own one, and want their brass turned on one. Are they right? I don't know. Ask them. Anecdotally, I would say most of these people shoot F Class, not benchrest.
There is no substitute for just jumping in and doing it. If people want idod turned brass, they will call you. If not, you need to turn it a different way or find different people. Don't get discouraged because some people don't like what you're doing or the way you're doing it. That's not a way to start a successful business. If people discover that turning the inside of the neck isn't what's best, they'll tell you, and the demand for idod turned brass will evaporate. You have to think of the service not as "idod turned brass" but "turning brass how your customers want it to be turned". You may even find it's not turning brass at all, but something else. You'll only find out if that works by jumping in with both feet and seeing what people want.