回复：很正常，这点钱对他来说是很多钱，所以么，可以理解。

Not true. They have a nice income, and I don't think this is a big amount to them.

Perhaps this is just their integrity. They never paid rent on time, and whenever I asked them, they blamed on postal office for late delivery of rent checks. I never charged them late fee, and maybe I was too nice to them.