Well if you are not looking for an audience, nor interaction with many, there is no need for more than the SP you already have. Having more than 500 SP gives you a slider and allows you to vote for the work of others for less than the full 100%. At 50% you can vote 20 times a day instead of the standard 10. Since you aren't interested in cashing out, putting it in savings might make more sense as it only takes a few days to get it back out.

I can certainly appreciate the fact that Steem brought together the diver and the knitter, and you're right about me, I'm a social creature alright and thoroughly enjoy your company and musings here.