Never had to worry about that problem to be honest, and I'm sure 90% of online players will tell you the same thing.
To be a consistantly cashing-out player you'll need to dedicate a lot of time and a lot of money to grinding.
$100 gives you 50 buy-in's at $2...how much a week do you plan on making with that??
It is a good base, buy i'd keep every penny in the account until your up to $1000 and rolled to play the $10-$20 buy-in's.
Then maybe you can maintain that as a bankroll and cash out $50 or so every week if your lucky. Dont count on it as an income boost though, Poker is a cruel mistress!
In all honesty, I've cashed out say 7 or 8 times, but never on Full Tilt or Stars. I've only ever taken money out of my Ladbrokes poker
account. It was a much softer site and I had some VERY good runs there. Not regularly though.