I think it should exist at least a warning sign like "Take care when chosing the name of your team, further changes are not allowed often and are not cheap - be aware of bad spelling and be sure that team names 100% made of lower cases are what you really want. Would you prefer your team named 'chicago lakers' or 'Chicago Lakers'?"
I personally had an issue with that, when I signed up I chose a name entirely on lower cases and that really pissed me off later... I had to spend 100k to change that and that's not funny...