Depends on what strategy u use.
No point beyond lvl 50, but below lvl 50 the high priest/lich combo is widely used to build up your stats. As is the high priest/wyvern combo. Barracks to lvl 10 is useful in LTQE that require opponents to attack a barracks. If your barracks is at lvl ten, they will lose their top unit (dragons) wether or not they win or lose the battle. Stats don't even matter from what I've experienced, u attack a lvl 10 barracks, you will lose ur best destructible.