The thing is it's actually quite hard to come up with a team, because the criteria are quite restrictive forcing people to pick older players that they may not personally have seen or know a lot about. You have to have a vaguely sensible formation and there may be one or two positions that are seemingly impossible to fill.
e.g. if you take the case of MU, you start off with the keeper, most people would be looking at De Gea, Van der Saar, Barthez, Bosnich, Schmeichel, Sealey, Leighton etc none of whom are eligible.
I'm a saddo who loves coming up with teams under various criteria (at school we used to make up London United etc) so I spent like half an hour coming up with mine, but most people can't be arsed so they either won't bother or will just include players who don't meet the criteria to get the team posted.