If you won't do your own tuning this is the only way to get it done the way you want. Few shops have techs who know anything about our small world. Most are paid little, do it for the discount on gear, and could give a crap about some weird board they've never seen before. In many shops the low man gets to do most of the tunes - it's repetitive, noisy, dirty, and hard work to crank out tunes for the masses. Oh - and most of the stuff brought in is in terrible shape so lots of work up front peeling layers of rust, etc.
For recreational use I prefer 1/2 degree base and 1 degree side bevel, do it myself, and don't detune for most boards. I've noticed the edge doesn't last as long the further from 90 degrees that edge gets - most of my riding is on Midwestern ice. When I raced I had a tech I paid on the side and the edges were always sharp enough to shave with (no exaggeration) - he wasn't afraid of a lot of edge bevel and the tune needed to last only a few runs.