I used to be able to make $3-10 per day just flipping pins (when they were allowed to be traded on here). Trades were 5 minutes each at max, and I was at the computer anyway... so that's a +.
That's a bit of a personal question, I think. Would it not be better to title your thread "How much can I expect to make on Sythe?" or something along those lines?
However it does seem that people here are open to discussing their Sythe income. Some 'pro' tips would sure help out the community I think.