Quite often, when filling in registration/forms/names etc.. it asks for a Title which is compulsory? Even PC Advisor does it. I have just entered a PCA competition and I have to fill in a Title. I don't have a Title, only a name. Obviously, in this case, I can't enter the competition without a title.
If I can't get past that bit without a title I usually put something like: Rev, Lord or The Right Honourable or something silly like that. I could even put Miss and it would be accepted, so what is the significance of that?
and whilst there are exceptions to the rule, most people have, and use a title - Mr. Ms. Mrs., or whatever. If I write a business letter it helps to be able to address it to Mr. K. Smith or Ms. K.Smith etc., or to Dr. Smith.
Like many things in life, it's one of those little niceties that helps to distinguish between a sophisticated society and the other kind, and as bremner suggests, it does does help with demographics - as does the gender distinction.
As this discussion is more about titles than web form construction, How about this. Various indivuduals of note, when discussed in the media seem to aquire titles. This is not to say they are not entitled to use them or be accorded them but are variously reported as in the current US secretary of state lady Condalisa Rice and now Dr C Rice, I was always amused to how the Ulster politian Ian Paisley is when reported variously -Dr, The Rev Mr . or MP Who decides when or where to apply a title?