As Overload said in so many words........ Priceless!
Anyone does not need to crave a pump, but a pump is usually a bi-product of a good BB'ing workout. Notice I said BB'ing workout. Strength work and hypertrophy do not always go hand in hand. If you are getting stronger, that does not always mean you are getting bigger. Seeing a middleweight PL'er now days push up 420+ for reps with a body's that looks "in good shape" but not anywhere near overbearing in muscle size.
A lot of BB'ers morf into strength training, without them knowing it, rather than pure BB'ing. Who really cares if you can bench 400 with a 44" chest and the guy working out next to you can only bench 315, but he has a 49" chest. And is much more massive all over than you. Genetics or just smarter training?
If your workout is sound and you are making progress on 5-8 reps than there is no need to do a couple of sets of higher reps at the end of the workout. That would be refered to as a Finishing set. This would also apply to leg exercises. If training with serious intent in the first place, than a finishing set is never needed.
The pace of a workout can influence the amount of the pump one gets in true BB'ing. Anywhere from 60 to 90 seconds between sets. This is called Time Under Tension (TUT) ,which some folks think only means the actually exercise it's self. It's the whole time of that workout. You do not need higher reps to achieve this. If hitting chest and triceps on a certain day and it take an hour and a half than your going at a snell's pace. Or you just like to look at yourself in the gym mirrors. Cutting that chest work time down to under 45 minutes (or less) might be a goal to keep in mind. Might surprise yourself as to renewed muscle gains.
If Deicide wants to experience the thrill of a pump than he might try running the rack. As one example; These are done non stop, no rest at all:
DB curls starting with a pair of 10's for 2 reps (some prefer 1 rep) when done grap the pair of 20's and do 2 more reps, than 30's, 40's etc. After getting into heavier DB's you may be limited to 1 rep. Keep advancing up until you fail at whatever the top weight might be. Now without any rest run the rack back done to the next set of lighter DB's. Go all the way back down to the original pair of 10's. If you prefer delts than do DB overhead presses. Remember again, this is non stop...no water breaks or short pauses. Top guy's do these ever so often. Not as part of a general workout plan, more of a shock value. Also consider the One and One Half system for a pump. Or Quad sets, again non stop.
As far as I am concerned (on a personal bases..others can do what they wish) an excessive pump just gives a bloated look to the muscles. Some tend to look like a over grown marshmallow after awhile when just working for the pump. And a hyper pump is never a indication that there is any real muscle growth to be had. It gives a false value to the workout. Good Luck.