I am not sure my "rewards" are decreasing in a long term. First, I learn where to find the more interesting stuff (my filters improve). Second, more interesting stuff is created (the internet expands). For example recently my "rewards" were pretty low and I felt like I will stop procrastinating online... and then I found LW.
I agree with the "read-only" mode, because being a part of community gives its own "rewards". This is how I reduced my addiction to the website I spent a lot of time previously -- I have noticed that I spend more time writing than reading (and that my estimates of the writing time are even worse than my estimates of reading time), so I decided to stop writing. After a few weaks, reading felt much less interesting.
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Perhaps this is already well known, but it occurred to me yesterday and I thought I'd share it. The Internet seems particularly virulent as a form of procrastination; indeed, if, say, chatting at watercoolers took up as much time in the average office worker's day, we wouldn't make jokes about it. What is the feature that makes it so deadly? I suggest that it is the random reinforcement schedule: Every five minutes you "press the lever", that is, check forum X or site Y. And every six or seven checks you get the reward: Someone posted something interesting! This random reinforcement is ideal for creating addiction; thus, for example, slot machines.
As a way to avoid this effect, I'm going to strive not to do anything on the interwebs except at precisely defined times, or unless I have a specific goal in mind, say "Look up this method signature". Wish me luck, or better still, wish me willpower. :)