I think you need to take another look at the pricing to see why people are going this route. Using Oceanics site as a pricing example the BM doser is $320 and nothing else is needed, 3 BRS dosers are $300 plus some type of timer or controller, which can range anywhere from $60 for 3 digital timers to a couple hundred bucks for a controller.
For myself with the equipment I've already invested in, a controller would be a waste because it just duplicates what I already have, so for myself something like the BM doser is more cost effective.
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