Napster users sharing accounts: common practice?

So, there are the low-tech methods and then there are the even lower-tech methods: why not just give out your Napster password to your friends in exchange for cash/barter/whatever? That's what some London teens contacted by UK's The Register are reporting is relatively common practice. Although Napster states that it is not possible to keep the same account logged in on two machines simultaneously, MusicAlly, a music industry analysis firm, found that in practice quite the reverse was true. They ran several test, during which they were able to both download and stream songs simultaneously from four different computers across two different internet connections without too much trouble for long periods of time. Other online music services, in contrast, automatically log the first user out when a second user logs in with the same username/password combination. Considering Napster just raised its revenue expectations yet again, it's clear they're attracting new subscribers — although it looks like not quite as many as they could be.