That's why they limit investment size. It's not to be purposefully exclusionary, they just have to be mindful of efficient use of time.
I believe most regulations that block this kind of investment are done in the name of protecting the little guy.
Otherwise, you will get people that have negative net worth, maybe $20k in credit card debt + student loans that they pay minimums on, and a few kids dumping a year of savings into Snapchat and losing it all.
While it sucks for small players that are ok with high risk investing (and would be ok losing it), there just isn't a way to stop the flood of stupid that would come with it.
Probably the closest thing I've seen to being able to invest in something like this is cryptocurrecy,