A fellow transmedia storyteller I encouraged to try Pinterest just let me know I am "flooding her stream so she has to unfollow".
I imagine an active bout of pinning by anyone you follow will put a flood of images into your timeline. That's the nature of the beast.
If you follow too few people or too few boards, you'll probably be like this woman, wanting people to post less so you don't suddenly see a ton of images of one topic or from one pinner if what you want is more variety in your timeline. (Algorithmically, perhaps, like you might expect at Facebook.)
But the beauty of Pinterest is the customizability (for instance, you can follow a pinner's specific pinboard rather than all of that pinner's activity).
And this isn't Facebook where one might be right to worry you're becoming a nuisance (to the limited numbers and strong tie relationships of most people's Facebook accounts) by posting every five minutes.
The reason we're on Pinterest is to pursue our interests -- it's a network of weak ties based on interests -- it's not connect to people we happen to know (nor are we concerned on Pinterest with making people we happen to know think we are behaving non-annoyingly on Pinterest).
The reputation I generate on Twitter or Pinterest is going to be about the quality and subject matter of what I share and interact with. I'm much less inclined at those services than at Facebook about whether what I pin or share pleases the people who follow me. That's for them to decide and adjust as necessary. But telling me not to do it, or do it less, however indirectly? Nope. Just go.
This is the exploration of my interests. You can come along if you want, but I won't be curtailing my pinning because someone who follows me can't figure out how to handle it.
Much like at Twitter, at Pinterest I usually favorite images at a fast pace then add them to my boards/share them with my followers at a much slower rate. And I consume much more than I produce. I still may post more than you can handle. At Twitter, I put high volume accounts on a list I can dip into so they don't overwhelm my feed. Pinterest could certainly use more flexibility in this area.