I almost resemble that remark.
I started out with a salt-bath annealer setup, for a little over $100. For a little more you can get at DIY kit similar to the Annealeze. After using the salt-bath setup recently to anneal some 50AE cases in preparation for reforming into 429DE, I decided I was at the point where I needed to seriously consider stepping up, so I just ordered an Annie Annealer. I admit, I am a gadget freak.
But, to get back to the OP, as far as annealing for 300BO I don't know that I would bother, for all the reasons mentioned. I've reformed 50AE into 429DE without annealing, and did not lose any cases in the process even after the first firing. I can't imagine that reforming 223 into 300BO would be anywhere as stressful and, as mentioned, would not make much sense unless you knew you would be able to recover all the fired brass. And 223 brass is essentially free if you are willing to scrounge some at the range. I have to pay $0.40 each for the 50AE brass, and I have had good luck recovering all my spent brass, so I am much more inclined to try to get as many loadings out of them as I can.