It does keep getting more expensive to claim them. I tried the first week with 2k sp and was just short. I had 2.5k a week or so later and just short again. Tried again last week with 3.5k and it had risen again. Every time i tried the number of RC had gne higher than the last time. It's not a huge deal i just bought one for 3 steem which is nothing but for applications wanting to onboard 1000 people per day it could be an issue.