Right after the HF20 mess was released @holger80 posted about his python lib and that it now supports account claiming. I was a few hundred SP below the RC limit for a new account back then. So I powered up to be able to claim one account back then (at 6000 G RC), but since the RC cost doubled since then I am to small to repeat it, despite continuing to buy more steem and power up.
https://steemit.com/hf20/@schlafhacking/fork-is-a-four-letter-word-erster-account-geclaimed

Of course, every account big enough should use all RCs that would go wasted unused on claiming accounts. On the other hand, if everybody claims accounts, the RC cost stays high as accounts are a ressource that is limited. See https://beempy.com/resource_costs and https://beempy.com/resource_pool