[howzit]

V1 is probably playing on game conditions by capping.

V2 could be too loose.
V1 wants to represent that he is steaming
V1 wants V2 to think he's pushing out the better hand
V1 thinks V2 is such a stud8 donkey that he'll call two cold drawing dead and will be committed for multiple bets on seventh.
V1 might put V2 on higher trips and wants to charge him.

could be any one of those and possibly others.