It seems like you would get a lot more traffic I know. First of all is 2k the EXACT or the broad amount of traffic and also is it the GLOBAL or the LOCAL. Assuming it is the EXACT and the LOCAL (this is usually the best guide to go by) and the keyword gets 2k a month and your position 5,
Generally you can expect something like this
#1 will get about 40% of traffic
#2 about 20-25%
#3 about 10%
#'s 4-10 on the first page can expect about 3% or less which is where you are
So with 2k a month and 3% of the traffic your looking at only 2-3 visitors a day so if your getting more than that then your actually doing good. Try to get it to #1 and you will be looking at more like 25-26 visits a day witch is of coarse significantly larger.
I usually don't mess with working on a keyword that has less than 5k EXACT AND LOCAL unless I feel I will have no problem making number 1, because although every little bit helps I don't feel 1-2 hits a day is worth my time when I could be using it on a KW with more traffic.
Good luck though and just keep doing what your doing