Do the developers know that most of us who take the time to install betas are power users and that we are aware it's not an official release? I for one hated that distraction and immediately reverted back and will not bother with betas anymore.
You can't. It's to remind you it's not a real release.
Rubbish, the 11 and 10.x beta's, not to mention all beta's prior never displayed the version water mark, only those obtained from the actual incubator page were water marked.
if these really are incubator builds then they should be distributed on the incubator channel
if these are distributed via the beta channel, the water mark should be turned off.