. 75-25 on cash games would be more fair tbh.
Just to make for 3k you need to play about 60 hours in 10/20 game with 10bb/100 winrate with no variance. If there is variance it's worse (if you win 9k once and lose 3k once it's only 1.875k for the staker assuming 75-25 split).
I don't know how many hours the stakee is going to put but his willingness to spend 3 days (at least) playing relatively small tourneys and very limited bankroll make it very unlikely the stakee puts enough volume to make it +EV for the staker.
Unless the stakee is one of the best players in the world even 100-0 deal with expenses covered is probably -EV for the staker unless somehow the trip to vegas is 2 months long or something