I'm late to the party here but speaking as a weekly host...
- a 6 pack of craft beer or a 750ml bottle of whiskey/gin/rum/etc., that you offer to the other players and leave the "leftovers"
- popular with my players are pretzels, peanut M&Ms, salty snacks
- occasionally a setup of the various brands of cards we use
- a case of toilet paper!!!
- similar consumables
- breath mints to use/share as may be needed
- slippers or indoor shoes so you can leave your shoes/boots on the welcome mat
Cool things players have brought to the game:
- a bag of 3D printed Buffalo Bills logo'd card markers (very popular)
- league themed room decorations
- your favorite poker table chair (some hosts might not like this!)
Other behaviors that are always noticed, appreciated and build trust with the host:
- good hygiene
- put your phone away
- help people get to know you
- pull your cards in close to your stack and cap them
- don't talk about the hand during the hand if you are not in it
- ask for permission before you give any advice to another player
- don't come to the game if you are sick
- respect the cards - don't tap them to check, don't bend them more than needed, speak up if you see a marking on a card
- be on the look out for mistakes during the deal, or the play of the hand and kindly act to correct them or call the Floor to address
- if you are seated in the middle of the table, help manage the movement of the cards and chips to speed up play
- encourage people to not splash the pot, to clarify confusing actions/verbalizations,
- be trustworthy - so many examples such as tell another player if you can see their cards when they look at them
- offer to help such as with setup before hand, chip ups, cleanup afterwards,
- know the house rules and help teach them to the lesser informed players
- improve your dealing technique (especially the flop)
- cut the deck carefully with the cards and cut card both on the table
- shuffle the way real dealers do
- deal the flop out as far into the middle of the table as possible - everyone wants to be able to see it
- volunteer to deal the championship game you don't qualify for it
- foster and participate in table conversation
- during the break, go to the restroom well BEFORE the break is over rather than in the last few seconds!
- and, in my league, we appreciate if people refrain from gratuitous swearing
Enough already!
HiveKueen