Thanks @naquoya, I need to do a little more research as @bryan-imhoff mentioned:

I also believe the increasing difficulty of Rep levels does not occur every level, it is every 10 levels. So getting from 50-51, 51-52, etc. is as hard as getting from 40-50. Getting from 60-61 is as difficult as all of the 50’s and so on.

So I am no sure if it is just the decades that rise or each level gets more difficult. The white paper is huge for Steem as it should be but not my forte at reading and there are conflicting articles so its hard to decipher it all. Thank you for dropping by :)