If you sell or buy large amounts of HBD on the internal market you will basicly have bigger slipadge/fee ... its bad for you, good for users making arbitradges or the stabilizer and the dhf. Its an open market trade on an asset with low liquidity

If you do the 3.t days conversions, you skip the market and make an otc deal with the chain so to speak. Thing is your peice is the 3.5 days average whatever that would be.