The pro/ent versions subsidize the standard version for everyone. However, the pro/ent users/sites are the ones spreading the reputation of the product that we know is great but the outside world has little clue about. Without a simple lsws header, lsws would get lost in the large "web server" surveys and with the still growing user base, lsws need all the help it can get.
There are more security features builtin to lsws as standard than most of it's competitors and I mean real security features. So let's not forget the real goal here: security through design.
I don't think it's necessary or good for the product but could see why some very few large users could have need for it. In that case, I say litespeed create a new "brandless" license like other software products. If it is worth it to you have to remove the name, pay extra for it. =)