friscuba:College profs and Doctors? The Jiffy lube guys might be a more fair comparison, although they probably make more than most instructors.
Funny thing, lots of people don't bat an eye at tipping the haridresser, waiter, pizza delivery guy, paperboy, bartender, hotel staff... but tipping the DM or Instructor who actually spent time making sure you are safe is off limits.
I don't think Instructors expect to get tipped, but why should it stop at the DM level? The DMs I know here in Kona all outearn the Instructors. Hmmm... lesser qualification, easier job, better pay... no wonder some of the best, most experienced Instructors here won't teach and prefer just to guide or Captain.
later,
How do the DMs outearn the instructors when DMs don't get paid. At least everywhere I have been the DMs don't get paid. They get their free rides and air then beyond that they work for tips.
I won't tip an instructor because I am already paying them for their service. I will tip the DM if they do a good job though. I do this even though they don't swap my gear over at the SI or carry my tanks for me. I usually dive (when boat diving) with the same shop and when they show I help the DMs carry all the tanks to the boat. I do this because they're my friends and I like to help them out. I swap my own tanks because that is just the way I am, my life, my gear, I'll swap it over. I tip them for the dive briefings and their help to ensure my safety while I'm in the water. I hate it when these fat, lazy, accident waiting to happen, tourists come out though and don't tip them a dime for waiting on them hand and foot. The DMs ensure their gear is hooked up, on right and that they don't kill themselves, but then get stiffed. They are working for tips only and the divers shell out anywhere from $80-$150 a charter, but can't throw $15-20 at the DM? I just don't get it. They tip a waitress that much and their life isn't in her hands.