Not much but it actually "depends".
Since it is a domain hack, we'll first need to look at value of the base keyword (Drivers).
Only 7 reported sales for "driver" keyword (which includes "Drivers" as well) above $5000 and 3 exceed $10k.
I paid $250 for buying Dolla.rs and sold it on Flippa Premium Listing (spending $350) for $550.
My net loss was $50 [$550 - ($250 + $350)].
Had an enduser "required" it, could have paid $1000-$2000 for spending $1k-$2k is no big deal for a business.
Answe.rs sold for $20k because a big company (answers.com) thought they need their domain hack. So, they paid what the owner must have asked, to them $20k is peanuts.
So, the answer is that don't hope it will sell quick, keep it 2-3 years, if you get lucky, you may get $500-$1500 some lucky day. Else, let it just drop and focus on better coms. Renewal of .rs is about $18.