I checked the results and found the tip question curious. How common is it to give one to someone who has provided you with good information about an investment?
Honestly, I think giving a tip after good service is commonplace among Americans. I do not know if it's universal behavior. And though the cryptos have made it easier, it's still restricted. On Reddit this was common, but today it is rare.
Here in the forum is even more unusual. I sometimes check the addresses that some users make available for tip. There are few who receive any value or who have accumulated something out of the ordinary. In investments I did not find any. In matters related to development, some have small values.
Aachow101, who is perhaps one of the most active developers who is always helping other users in the forum, receives practically only BTC for moderating the forum in his address that he makes available in the signature.
https://www.blockchain.com/btc/address/3F1Y9yquzvY6RWvKbw2n2zeo9V5mvBhADUGreg the same thing, received only the payment for moderation.
https://btc.com/bc1qqwepu8ejet4e25c4v4hy7fh8yysa03hkm9q6p9