Because otherwise the "sugar babes" would be able to see it (fairly easily). Of course that's still possible but the risk is much lower.
And in a way it also helps the privacy of some of these girls too for 'outing' as such - its viewed by plenty as is, but some girls are discussed at length and I'm sure they hope their details are limited as such.
The hidden thread is pretty much the best resource online aid with blocking the scam artists on there - as well as sharing of advice and experiences as you go alone.