Participating in the DSPP as outlined in the recent prospectus would be a disaster for the retail investor (again).
Participation provides ultimately owning the stock at a significant cost over market price. And, in this case especially, dilutes current equity (ie; you are hurting yourself if you invested in prior DSPPs).
Normally derivative based placements are reserved for what the industry describes as "Sophisticated Investors". Zion is choosing this approach because they are counting on potential investors to be anything but.
However, this is a great time to dollar average in by buying a fixed $ amount of stock each month through the DSPP.
Say watt??? LOL If a SH wants to "average down" their previous buys at $5...$1 in this scam, they can just buy in the open market starting at today's 0.43 all the way down. There's no need to pay $1 for stock going for 0.43. What's that? The warrants? Yeah, since the latest is an amendment to the 10-May-17 offering, all those warrants need is a PPS of $5 for 15 days. All one needs is one of those divine miracles. Else one is averaging down with a constant $1/shr price, not a lower market price.
One should always build a position in a stock/company that's under a SEC formal investigation, and has several class action lawsuits coming at it. A company which despite multiple PSPPs in the last 3 yrs has no assets, and seems to have mastered the art of drilling dry holes. There's nothing to build on.