Spoondoolies has enough margin that they can do decent discounts on volume, for ex. Ditto fo the other manufacturers.

MBP can simply pass some or all of the discount as whatever they want like, say, old equipment buyback. I also doubt they will bother with powering them up (maybe some for personnal use, or target a specific range of equipment and scrap the rest).

They might want to clear the second hand market of old equipment, but I think it would be futile. Power consumption decrease and harshrate increase for new equipment already do a good job of pushing old hardware to the scrap heap (you can still warm up your with them house though). There is a point where running a farm with old equipment is getting more expensive than running a farm with new equipment (even if you got the old miners for next to free and ditto for KWh). You still have to build the farm an maintain it, and that's not free.