Everyone, no matter how many squares they have, can rep 6 people in any 24-hour period. The value of that rep depends on how many squares and posts they have, but it seems everyone gets to rep 6 per day. You can re-rep someone after you've spread it to 30 other people.
I love ANY rep I get. Honestly. I even love getting rep from newbies whose rep is still neutral. It's just a nice feeling, you know? Someone thought enough to take a moment out of their day to let you know they liked what you said, or how you said it, or who you are. That's never disappointing.