I don't know why this is such a problem, people. If someone is truly whoring the block, they are gaining NO PL WHATSOEVER (well, pretty much). If you are at least trying to fight, you are stronger.
I throw on the scouter, have a peak at the PL. Since I'm aggressive (I play Vegeta, hehe), I usually have a much higher PL.
Then what? Any beam detonation can damage them, and if not, chances are a full blast final flash or gallit gun can push them into a wall, using their own ki against them and blowing them up without much effort at all.
THis technique will seem more useful in Beta1.1 when we are actually invulnerable during block struggles, but I find it works pretty well now.
And with the assist of the other dude's ki boost...well chances are you will eradicate more than just him. Hehe.
AND you get a hella PL boost for the struggle, too. >:0)