Actually I just don't think they are worth the cost in troops for such measly XP rewards. Basically falls outside "reasoanble" for me.
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Just managed to squeeze 440 K xp from YWC.
http://prntscr.com/krt8af
Forgot to take a screenshot of the other part of the XP, but, it was half of the amount on the link (146667 xp).
I've recently updated my Wisdom guide to use Boris currently. 867k xp with scout hut and permie.
http://prntscr.com/njy57f
867344 xp
https://forum.thesettlersonline.com/...l=1#post338116