I'm envious... I've done about 3,000 points lifetime. Good articles can be time-consuming to put together.
If you're sitting on the fence about whether the effort is worthwhile, do the math: If 100points gets you a $15 dollar Gift Certificate (Amazon, LLBean, others), each point is worth $0.15.
Surely your 1040 form reflects your $4,500 in additional earnings? ;-)
Cheers, and keep up the great input!!