Raiding Unit Boost Buildings = Higher casualty rate for Valuable Units?

[RedLabit]

I just attacked and raided a rival with defense 12% of my attack strength.

I've no casualties when attacking and raiding his money buildings. Then out of fun, I raided his infantry boost building lvl3 and I immediately lost 2 GIGN, 1 Ghost Operatives, 1 Armed Steel Worker and 1 Flame Thrower...

Yes you guess it..my jaw went to the floor...

However, I'm not sure if this is a unique repeatable experience and I'm not too keen to try again...
Anyone also experienced high casualty rates (especially valor units) when attacking a high level Unit boost building?

[Jhoemel]

i dont attack unit boost building cause I think you wont gain anything except lowering the boost of the rival

[Aidan]

Not sure about boosts but i had the same experience with defence building.

Was valor farming this dude with no loss. Then decided to hit his detention facility. Bham! 2 SH and 1 HM. I was like What the fck just happend!!