On the one hand, you can't get much more personal service than a cavern guide. On the other hand, cenote dives seem to be about 50% more than boat dives and without all the overhead of a boat. Entrance fees are low, maybe $10USD. Where's the money going?
I wish I knew more about how the cenote dive business works. I don't how much of that money is going to the guide. Hard to believe they are working for tips. Makes no sense to tip someone who is already well paid.
As a full cave diver and cave instructor oc and ccr, a guide is really useless for a caverndive. We wanted to do a special cavern due to it strange stalactites, but it wasn't a real cave, just a sinkhole.
The entrance fee was about 20 dollar, but the fee to take a camera was not included.
Rental costs if we rent tanks including ean32 is normally 13 dollar per tank per day. So then you can say 50 dollar for tanks, 20 for entrance fee, but the rest?
We did not tip, the guide was ok, but was not the best. It was 'no deco', but we are trained (and both are instructor trainers for trimix as well) in making decompression dives. So this was for us too much 'sportsdiver holding by hand diving'. So we did not feel any need to tip. A good review on internet for the divecenter will do it. The dives where also done in quite a rush. We had to be back at 2 p.m. in the divecenter. There was no time to swim between or after the dives, but also that was possible in the entrance fee for example. We are used to relax between and after dives near a cenote. So the cenote was ok, we agreed with the price before the dives, but we don't see any need to tip for such prices.
The restaurants that didn't want to have tips were 7km outside tulum in a smaller village or so, a sort of streetfoodmarket with only locals. We had a lot of fun with that place, at seller one we bought a drink, seller 2 tacos, seller 3 another drink, and the next day again. They did not talk English, I only a few words Spanish. If we wanted to have fresh orange juice, we went there.