Yeah i think i will still give tips. Always have and always will, unless I truly have a horrible experience. Maybe my tips will somehow help the locals and local businesses.
As far as dive guides. Would i need to hire my own dive guide? I know each dive there is a DM assigned but would it make a difference hiring your own guide?
I read on this forum that most dives end in 50-60 minutes or probably less depending who is diving with you. Would hiring a private guide allow us to have longer bottom time compared to a DM whos watching over a group of random divers?
Depends on whether you are shore diving or boat diving along with all the usual caveats that come with extended dives anywhere else.