it gives a low roller a low profile
which is why it is not really a good idea to not get the cards. They don't pay much attention to that action anyway. As soon as you bet at a level that the casino will notice you it draws far more attention when you refuse to be rated. This, besides the fact that 20% or more of the total value you extract from the casinos in your career will come via comps, cash backs, free gifts, tournament entries, etc, all derived from player rating. For many card counters, those who never ultimately win, this is the only thing they ever get. Get rated and take your comps. Try to get cards without ID when possible and get rated under an alias.