I have not seen much use for it, as I've always gotten agents to pull comps and list houses for me.
But since you've already taken the classes, it sounds like it's a question of how long to keep it.
You could make some extra money listing and selling your own houses yourself. But ask yourself if $1000 is worth the effort, since that's all you're saving (I've always found good flat-fee agents to list and sell my houses)
You could list other people's houses or be their buyer's agent, but is that what you really want to do? I don't think it would be worth it unless you do it full-time and build a real business. Otherwise, make investing your side business in addition to whatever you do full-time.
Also, I haven't heard of anyone not wanting to rent a house from someone who happens to be an agent.