That's not a really feasible idea. It's open to exploit, but aside from that, SB points have value because they are scarce in the first place. Flooding the market with SB points would make them lose their value and be counterproductive.
Just want to add that you can write reviews on games/movies/books and earn up to 200+ sb points, and you can also take part in events like sb points weekends to earn sb points. Posting a mod showcase earns you 400 sb points