I do.
As was mentioned before, better articulation. This is due to the fact that if you mounted a shock vertical, it would have to be much shorter and would limit rear suspension travel.
The top forward canting probably helps dampen motion with respect to the movement angle of the 4-link arms.
Also, the top of the shock IS mounted to the frame......via a stamped, welded bracket, NOT to the body.
The springs are handling the majority of the load forces, all the shocks have to do is dampen spring oscillation.
I really can't remember seeing a shock mounted perfectly vertical, maybe these are some reasons for this.
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