Probably true. A Core i7 3930K can get to 66.6 MHash/s, but almost nobody has one of those. At 6.7 MHash/s (mining speed of a Core i7 2600K), it would take over 82,000 CPUs to match the Jupiter's 550 GHash/s. Although the largest botnet ever had 30,000,000 bots...
Which is faster a bicycle or a jet airplane?
Not a good analogy. 100,000 bicycles are still slower than a jet airplane, but 100,000 CPUs could match a Jupiter.
Most botnet computers don't even hash at 1 MH/s, just FYI (speaking from significant experience dealing with the damned things). Most people with i5/i7 computers know enough to see their computer is running slow as dirt and the fan is always spinning fast. Not saying they're immune to it, just saying the vast majority of high end CPUs are not in botnets, they're mostly made up of low end.
Also was only referring to *active* CPU miners, rather than all the infected computers on earth. Most botnet operators aren't touching BTC because a CPU miner is not worth as much as a spambot/ddos slave anymore at modern difficulties.