1. Supply 724,000 REP as collateral
2. Borrow all the Dai available.
3. Send Dai to @ParadexIO and buy ETH.
4. Lock ETH in CDP to protect.
Proof below...

And then gets moved here etherscan.io/address/0xe4a8…
At that point, it's used to buy ETH on @ParadexIO
You can see that ties out to a wipe of the same amount (1291) on their CDP mkr.tools/cdp/2715
Why not flip the REP for ETH and pay that way? My hunch is taxes.