Looking on Steemwhales I see that there are over 50 accounts worth over $1m. Some of those are exchanges and some will have bought up Steem at some point. Looking at the top posting rewards it's not looking like anyone made a million just from that. Those who made a lot from curation must have had a lot of SP near the start.
The current price rise has boosted everyone, but some believe this could be a pump and dump. Time will tell. I'm sure Steem will get back to $4 and beyond, but it still seems too early to me. When we have millions of users it will be more sustainable. In the longer term there will be many millionaires here.
I expect a few people will be selling some Steem for Bitcoin as that is more stable. It's certainly tempting. I'll still keep my SP for now.
Steem on!
Mine cryptocurrency in the cloud at Eobot, including Steem. You can earn as you chat using WowApp. If you use these links I get a small reward. You can recruit others to do the same.