Interesting - several months ago I also sold off about 3/4 of my main SL account, which I'd been consistently making it to Champion with, in order to build my dCities :)
I purposely held onto the rest, just in case SL mooned. So, while perhaps I'm a bit sorry I sold off so much, I'm also glad I kept what I did.
Yeah… different strategies for different folks. I mainly wanted to hold onto some SL stuff because I'm running a bunch of bot accounts. If there hadn't been the option for passive income via bots, I likely would have sold 100%.
The release of SPS and staking was a nice perk as far as I'm concerned, because now I have two ways of earning passively through SL.
But I do think you are correct re: spreading yourself across multiple Hive games. It's probably best to keep to just a few, and hopefully pick the ones that will pay off in the end.