There are many, many debates on this going way back. Anyone interesting in a lot of reading on the issue might want to try searching for some of those old threads. Some of the people who've come on to some pretty good tricks have not shared because sharing has often led to closure of loopholes (Pudding Guy didn't tell people what he was up to until after he got his miles, for example).

Many people seem to use some discretion when posting publicly, while doing their best to share at the same time. In general, a lot of the best tips are frequently shared at FT get-togethers and through emails with FTers.