So..Marc does think he is going to win despite his 'I want to go home now'
 

An innocent chat in the diary room with Chloe...telling BB Marc's good points and bad points. In the list of 'good points' he apparently tells everyone he will take them with him to Vegas with his 'winnings'.?!! ..So he really does think he will win. The arrogance of the man.

Wish he would go home now. BB has obviously told him he will win some money with the Cashbomb thing

Yep, he has been informed about Cashbomb so he's primed and ready. It's obvious BB is feeding him information exchange. e. g. Aisleyne sueing her pal on Judge Rinder etc