There is zero reason to post your best stuff here and only here. In fact, that would be a big mistake. Especially longer posts on lesser known topics ... those take time for people to discover and appreciate.
For me, the 7 day limit forced me to reconsider a project I was planning on Steemit. There are better options financially (outside Steemit) that allow for the possibility of residual income after 7 days. As far as this project goes, Steemit will be a place to recycle the project's old content to give it a second life.
I only recently learned about all this and posted 7 Days to $0: Those Worthless Old Steemit Posts