.pk really isn't taking off.. and at the moment for almost any keyword I would have to say +/- regfee.. in the near future they may be worth a lot more though!
1. Poker.anything is selling for at least $1,200 these days. That was somewhat higher end, but Pakistan is more than a nameless country, whereas .vc, .sh, .gs, .tc, etc...who knows?
2. That said, while .pk is IMO better than the average lower end extension (including .im which people seem to be going nuts over), you're still not going to see a whole lot of sales for a while, and many of those will be top keyword names, which none of those are. Answer.pk is decent, but won't net you much over reg fees until the .pk market has been established, and even then, probably not a whole lot more. FreeHost being a 2-worder has less potential for a sale than Answer IMO. Good luck though.
It need some time for .pk to show its value bacause currently some good keyword dot pk are still available. Anyway. i think great keyword dot pk are worth to be registered.