NLCASH: Opponents buying in short

[Agamemnon]

I see a lot of people buying in short in my games. I always sit down with a full BI of $50 at Prima, but most of my opponents sit down with $15-$30.

Kind of a stupid question, but do they gain anything by doing this (other than annoying the hell out of me)? Are there any strategy adjustments I should make when playing shortstacks?

Thanks.