With regards to Twitter specifically, that username is essentially being squatted as it hasn't been used in over 6 months.
The account has been sporadically used since at least March 2009, with breaks of many months some times. I don't see that as a good reason for you being able to nick it from the current owner.
It certainly isn't squatting in any way I understand it. My wife very, very rarely tweets. That doesn't mean that she doesn't use it or that someone who picks the same account name should be able to take it from her.
Personally I don't think it has anything to do with poor versus money.
I wasn't using the word poor with respect to the bloke's financial wealth.
I'd like to continue investing in the brand and eventually it might make perfect sense for someone to infringe purposefully.
We are talking about a musician who probably likes the Happy Mondays, he isn't trying to tarnish your brand image.
There is also a facebook user, which is clearly a Happy Monday's fan, I assume you are going to try and take his url from him too ?