My girlfriend has a farm on the Thai countryside and sometimes she buys bags of pig poo for use on her farm. She always asks me to help her pick up the bags and

My girlfriend has a farm on the Thai countryside and sometimes she buys bags of pig poo for use on her farm. She always asks me to help her pick up the bags and move with our pick-up to her farm. Then afterwards I have to carry the bags maybe 100 meter to her farm. She told me if she pays people to carry the bags, it would cost her an extra 5 THB per bag. I always feel like I am wasting my time, as I feel my girlfriend doesn’t understand that if I’d spend the time working behind the computer, I’d be making much more money. And to spend an extra 5 THB per bag would be a negligible cost for me. Or perhaps she does understand it’s more cost effective if I work behind the computer, but she just enjoys seeing me do some “hard labour” (she tends to show a grin when I am carrying heavy bags around).