i play them during College BB for $1-$5 a shot...look for underdogs of up to 5 points that i think will win game and low favored teams i think will blow out the other. what's a $1 or $2 bet? Like buying a lotto ticket.
i never played one, but if i did, i do the exact opposite of what they suggest
in teasers, i would try to cross zero and try not to cross too many key numbers.