There are plenty of scams out there. It will help if you sign up for a legit singles program. If you are out just randomly trying to pick up chicks in chat rooms or myspace....you will have less luck.
Spend more time on selecting who you write to, it is less likely for you to be disappointed. Find a site that has something of interest for you. SciFI.com, CNN.com, uTube ...a dating site, or message board where you can voice your personal opinion on a subject you are passionate about. Build on a mutual foundation.
Put your best foot forward. Put a flirty spin on it.
"Hi! I like blondes with deep cleavage," is not a good opening.
"Your work in animal rescue must leave you exhausted.....what do you like do to relax at the end of the day?" Shows that you are interested in her as a person with a life.
Ranting about your ex-girlfriend is not a good topic for conversation, either. (Surprising how many guys think that women find this interesting.)
Be yourself.....look in the right places....narrow down your selection criteria......from "anyone in the 75150 zip code who responds to "Hey You!" to: "a friendly, animal loving, spirited woman who loves children" should get you an occasional good pick.
Good Luck.