Sir there is no point showing disadvantages of SIP in case of bull market.. ur NAV has just gone up and that is why ur returns less.. who could tell u in august 2004 that markets will go up like hell in coming year.. no one can.. and to avoid that we go for SIP.. if market crashed for 1 year after ur purchase then u would have seen advantage of SIP...so this illustration has no point..as u drawing a comparison on something which has already happened..can u invest something huge today at 17700 sensex..and say SIP wont work.. does anyone (who has knowledge of market movements) put all wealth in mutual funds right now and say its better than SIP?????