Hi!
Reverse DNS does but they did not bother to create the corresponding forward (ie "normal") entry...
They can usually auto-generate these entries so I am not quite sure why they did not...
One would expect to have these entries present by default and not have to ask for them...
OK, in this way they are similar to the Internet Service Provider I use at home...
The one I use for my VPS actually let's me change the reverse DNS entry by myself and of course I have to create the corresponding forward/normal entry in one of my domain names...
Yes, they got lazy... 
Case closed...
Have a nice day!
Nick