Leveraging a CDP loan with extremely low liquidation price (ie. $0.75). Why not?

With the ETH price so low, there is no reason not to open a CDP and draw an amount of Dai that puts your liquidation price extremely low, like $0.75, then buying ETH with that Dai. The long-term upside greatly outweighs the risk.

You're leaving money on the table if you don't do this.

Edit: Actually, one reason you might not is if ETH->PETH is a tax event and the conversion would be a large capital gain for you. But in that case, you could simply reduce the amount of peth bought so that the tax owed is sufficiently low.