I think you are underestimating how large (what is being referred to as the Bethesda acquisition) it actually was.
I know bethesda is just part of Zenimax Online.... the parent company or whatever.
However again if you google "zenimax online revenue" the 1st results are:
"ZeniMax Online Studios's estimated annual revenue is currently $81.4M per year."
I guess if your planning like 20+ years down the line, you might eventually reoupe the investment.
Necro-bump this 2020: http://gamrconnect.vgchartz.com/thread.php?id=229249
Bumb in 2021: http://gamrconnect.vgchartz.com/post.php?id=9047071