Actually, those pictures are quite mild if you have seen serious ball play. *One of my BFs in NYC used to hang all sorts of weights from mine. *It actually feels rather nice. *The thing to note is that this is ball PULLING or STRETCHING, not ball SQUEEZING, and when the BF confused the two, I let him know in no uncertain terms. *How may guys just want to have a nice set of low-hangers? *Ball stretching may be an effort to get there, just like cock pumping...
Real ball torture, on the other hand, invoves things like ball squeezing. *One can buy ball crushers, which use screws to crush the balls between metal jaws when tightened. *Others have the jaws made out of thick plexiglas, so the crusher can see the crushee's balls spread out as the thing is tightened. *Other versions of these also include electrodes for electrostimulation. *Then there are things like temporary ball piercing, nailing the scrotum to a board, scrotal inflation, etc. *Now we are getting into the sick things!
For the strong of heart, check out this ball crusher with electrostimulation offered by Chase Union:
http://www.chaseunion.com/cat2/index.html, and select "Visible Ball Crusher" or "Cock and Ball and Ass Toys." *At S/M fetish events, the vendor market will usually have devices making even this look rather tame. *
There is a whole genre of ball torture porn videos. *My ex used to get very excited about this one where the guy shot a big squirt of cum each time the screw was tightened.