We see Groupon in action with Dive Instruction at the Blue Heron Bridge Marine Park every weekend....often a dozen big classes, typically with bumbling unskilled divers dragging consoles and guages along the bottom, and kicking and stomping on the benthic marine life as quite normal...for instructor and student alike....it seems to me that the more a shop is likely to go with groupon, the less concerned they are with buoyancy and the marine life they will kill....
Case in point...this groupon class:
[video=youtube_share;dgdabfvr2B0]http://youtu.be/dgdabfvr2B0?t=42s[/video]
Click in to 42 seconds into play...and watch in HD
The instructor--the old guy with his back to you in the beginning...is walking on top of the area the best Macro photographers have shot some of their best Nudibranch and Frog fish shots..in the Hydroids that you can see all over the bottom there. This is an environment, just like a coral reef is an environment.
Groupon is often an incentive to cut corners on skills like buoyancy and to ignore delicate marine life because the COST to worry about it is not compatible with any use of Groupon we see.