Is it considered bad etiquette to raise on a fairly obvious split-pot?
e.g. straight/royal flush on the board, or quads on the board when its fairly expected that both players have an Ace.
I get quite annoyed with it currently (online play-money), as the rake is %-based. I know its not against any rules i know of.
When the nuts is actually on board, like T♠J♥Q⋄K♣A♠, I would say it's probably bad etiquette to continue raising in a cash game where the rake will be affected accordingly (although I have in the past seen people fold on the river in situations like this, albeit infrequently, but it happened!).
In a tournament (where rake is not a consideration), it's only likely to be a small handful of raises until you're all-in anyway, so unless someone is taking an age to make each raise, I don't see that there's any significant detriment or inconvenience caused, so I wouldn't consider this bad etiquette either.
While most games are governed by rules which include one to penalise players for not raising on the river with the nuts (to prevent soft-playing), I've never seen this enforced when the nuts is on board and would expect Rule #1 to take effect (i.e. common sense or an unusual situation can permit a floor to make a decision contrary to the rest of the rules).
However, when it is possible that it's not a split pot, I think anyone is well within their rights to raise as many times as they would like. If you have Ax on a 22223 board, why should you give up potential value against someone playing Kx who might be willing to get all-in?
All that said, what is and isn't good etiquette is basically a matter of (mass) opinion, so one person's view is not necessarily particularly relevant - it matters what "most" poker players think. If enough players started changing their mind and felt that some particular behaviour was unacceptable, it would become bad etiquette where it might not have been previously.
No, it's not bad etiquette to want to try win a pot. You'd be surprised how many players don't realise an obvious split-pot.
Fairly obvious. If you have the nuts using a card in your hand you should bet it (or slow play) every time. For sure you don't check the river.
Nuts on the board is another thing but that does not happen very often.
I am just not buying that nuts on the board is happening enough to annoy you. It happens only 1 in 6879 hands.
As Grince stated some players don't recognize a split pot. +1
As for fairly expected both have an Ace that is ridiculous. A hand that can only win by bluffing could be bluffing.
KKKKA, QQQQA etc? Unless I'm missing something, any quads on board with the highest possible kicker already on board would be the stone cold nuts as well? I assume your 0.0002% figure comes from just AAAAK, and not the other 12 nuts quad boards too? Doesn't change your point much (0.0002% is hardly much different from 0.0026% in the context of this question), but I'm just curious.
(13 * 4)/COMBIN(52,5) to represent the 13 * 4 boards which are quads with top kicker and COMBIN(52,5) as the total number of possible boards, but I get 0.002% with this method, not 0.0025% - what have I missed?