No if you do not want to
However, if you wanted too I'm sure the guide would be complemented by the gesture.
My husband always tips. In this case I would say it is your choice. If you liked them tip them. I don't think they earn much of a living ...
Personal choice - I always tip if I feel the guide provided me with added benefit. The happier they make me, the more generous I am :)
Tipping is not necessary but it is your call based on how you feel about your guide.
Definitely not necessary. We gave ours $10. They have a little sign that says "tips are appreciated", and we liked our guide, so we tipped.
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