You are limited to so many every 24 hours.
"1. Rate up to 60 pix every 24 hours at ® 0.05 rays = ® 3.00"
This means, after 60 picture ratings, you will stop getting rays until 24 hours have passed. This applies to the others, with the exception of picture uploads which is 40 per month, rather than day.
I don't believe there are any limitations to profile and blog views you receive from others though. Although, from my experience I don't think I always get the 0.05 from my blog being viewed.