That's an interesting idea. Right now I'm just trying to get more money to put into STEEM so I can increase my SP faster, but I suppose at some point one might start sending the money the other way.... earning on Steemit to buy other crypto. Other crypto appreciates in value, but to me only STEEM both appreciates and helps you earn more of itself when it is SP.
When you say other "stable" coins, do you mean you don't want to be "all in" just on Steemit related coins?
Yeah, putting sbd etc into sp has a really great return on steemit. I don't like to put all my eggs into one basket so to speak. This is not that I'm second guessing steemit, but it is always a good investment to have diverse options. For example, I also invest in gold and silver, the new and smaller/cheaper "shit" coins, as well as powering up my steem and buying pieces of dash, monero, ripple and so on. You can do a great deal of trading on only a few sbd.