now, that is a bold move and commitment to their own project, i like to see this!
Apparently some other market participants also waited for a sign like this and are now confident enough to put a larger chunk of PETA into their portfolios.

I am really curious, how many shares there will be left for cryptx to pick-up this sunday  

As for dividends, I guess nothing changes. The hardware is bought and thus the money needs to come from somewhere. Either ipo money, or temporary 100% reinvestment of btc mined(-cost obviously). As there was no announcement in this regard, I can only speculate.

Nevertheless, even if for some weeks every bitcoin mined (minus cost) goes into paying off the hardware, I would still be a very happy PETA shareholder

Technically, "buying" their own shares simply means not offering to sell them on the market and resuming open market trading early. But I don't care as long as it works... Remember, that currently they generously(!!!) do not pay dividends to themselves for the shares they still have unsold from the ipo.  Now that they officially "bought" them, they will (and should!) pay themselves dividends on those shares. Don't think your dividends won't be lower...