I think the fact that people are allowed to invest in gold and bitcoin and lottery tickets shows that the government doesn't actually care about the unwary gambling away their life savings. Rather the government (or those who control it) want to ensure the best investments are kept for themselves. So they place barriers to investment, like accreditation, to ensure only those who already have wealth can participate in the most lucrative of markets. It's not "for your protection" its for the protection of the wealthy.