Posting my personal experiences separately from my initial post.
As others have said, go into this as it having entertainment value & not a ROI.
Don’t spend money you can’t afford to flush down the toilet LOL.
I currently have 43 individual horse & 3 bundles that I have shares in.
I have 17 past horses.
Some of which were sold, claimed, or otherwise retired, and 2 ended up being euthanized due to medical reasons.
While MRH sends out regular updates, You’ll find that some trainers are more generous with their updates & passing on information than others. So if that’s something that would bother you, maybe don’t go with horses heading to those trainers.
MRH has horses racing all across the US, so some people only buy into horses that will be more local to them & that they’ll be able to watch race in person.
I don’t live anywhere near any tracks, so that isn’t a concern of mine.
I’ve been pretty lucky in that other than my initial investments, I’ve had enough horses making money that I’ve been able to continue to purchase shares in horses using my “MRH money” without having to dip into my “own” money.
I don’t ever withdraw my MRH earnings. I just always put it till it over into new offerings.
So far SNC & STG have had the biggest returns.
Maybe one day, after all the kickers & bonuses have been paid for, Authentic will pay out as well 
I was the kid that hung out at the local fairgrounds all summer, watching the local circuit races (we had both harness & flat racing) & pestering the owners to help with chores, brushing horses, etc.
It was something I looked forward to every year, until they finally did away with the races. I learned so dang much that wasn’t in any of the hundreds of horsemanship books I read growing up.
When I first heard about micro shares, I jumped on the bandwagon immediately. It allowed me to connect back to the world I spent some of my best moments in… if on a bit of a different level.
It’s been a blast for me.
Some of the people in the FB groups can be asshats & Debbie downers. Most of them are pretty decent overall.