Single SNGs

hi druff!!! hows it goin! once again, props for your peoples site. i finally figured out how to post stuff, and as you seem to be the sanest of the whole never win team, im gonna ask you(already posted this question in my blog, but no answer): as ive said, ive been playin poker for about 3 months, and i suck. im a bit better at sngs than cash games, so here goes:

so lets say im playin a 5$ SNG, and im the big stack, with 6k or so. we are 5 people, alltogether, with everybody else about equal (1.5 to 2k) and one tiny stack of 550 or so. the blinds are 100/200. now everybodys playing real tight, and are of course avoiding me.(is 5 people already considered the bubble?) and the small stack hasnt done anything for ten minutes, so hes obviously waiting for a big hand. now, all of a sudden, he goes all in. lets say i have a real bad hand, like 72o. would it be a good idea to actually call him, practically giving him his double up, to keep everybody playin nice and tight? how about with 4 people?

like i said, im still really bad at poker, and i dont wanna smart off or so. but it has seemed to work a couple of times for me. i expect that somebody has either thought of this before, or that its a dumb idea for some reason which i havent realized yet.

anyhoo, id be happy to get an answer, as detailed as possible:-), and i wish you the best of luck, druff dude!

and as a gesture of premature gratitude, heres a picture of a hot albanian chick!! (from my private collection:-)