I have mine bent 12 degrees.
For me, it helps get the bell up & out of the music stand as my natural angle is down a bit.
Two things started me doing this.
1) I'd seen a video of Chuck Findley playing. Reading a chart with his bell up and out of the stand.
2) That same night I'd gone out to see some frineds play in a big band. During the break I was asked how things sound out in the house ... well ... I told them I could hear them fine, when their bells were up & out of the stand.
So .... the 6.5 watt light bulb went on over my head "

" and I sent my mpc to Bob Reeves and had him bend it. They (@ Reeves) heat the mpc with a torch to soften it up a little, makes the bending a little easier. I've had all my mpc's bent now.