I know this thread is a bit old, but I tried my hand at a couple 7 card hi/lo games this past weekend and didn't do too well.
I lasted about 30 minutes in a freeroll, where my stack was up to about 8000 chips, just to loose it all to one player who could not loose a hand.
I busted out of the freeroll tournament to this one player,
where it seemed like it didn't matter if I had the high pair, two pair, or trips,
this player would still take the pot with a hand that was just that much better.
Since I only got about two or three good hands in each of the two different games, I figured it was time for me to give up playing cards for the day.
So, I bugged out of the play money tourney too with half my chips left.
Some days you just gotta give it up and try it again another day.