To be profitable in HU Sng's at the micro buyin level, you actually need a very decent winrate to stay ahead of the rake (tourney fee). I'd never suggest them to anyone as a method for building a roll. I look at them as a an oppurtunity to play some headsup & not much else. I'll also play in them vs. friends (try to log onto one that is in the lobby at the exact same time... then when you're fortunate enough to get on the same table, just keep hitting 're-match'... < I've played quite a few sessions this way & actually was alot of fun).
Even the high buyin HU Sng players usually aren't profitting much from playing them. I've checked out a bunch of them, some with ~$800 avg. buyin, many games played and often they'll be like ROI +0.2% (or even less). There's only a few who are making a killing at them (from the players I've watched & checked out... ie. one guy was up like $600K, just from HU Sng).
With $5 I think I'd take a shot at 2nl tables &/or use it for a priv. tourney buyin, where there's 'cash-added' & is always worth it to play (ie. the 4kingpoker Fulltilt games!!!!!)
Brad Booth - > "Like a fight... it's not how you start, it's how you finish"