As a staffer who loves playing on the game I staff on, I find myself playing the alt less and less so as not to interfere with the decisions of storyline and I don't want to feel as if I ever spotlight my character. More importantly, I don't want the playerbase to feel as if I spotlight my character in any way. It ends up with me leaving myself with such a small amount of character development that I lose interest in the character. I agree there is a fine line to balance between personal plot and group plots to increase rp within the game and I always err on the side of caution and keep my role in plots minimal.
As someone said earlier and I completely agree, having staff repeatedly run plots for single character development shouldn't be abused/taken for granted either. I've come across that recently and I truly think if the player wants that lengthy of a plot for their own character, they should do it as a PrP. Otherwise, I've noticed that there is the misinterpretation that there is staff favoritism towards one person or a small group when in reality the player asked staff to run different plots for them.
For a game to grow, I believe it needs input from more than one or two staffers, I've just recently come to that conclusion. Fresh ideas are brought in from others and also, like was mentioned before, bring the opportunity for staff alts to get involved in plot that they do not run themselves and thus leave them the opportunity to shine as well.