After making sure you have a full profile showing your social proof, and telling about yourself, the best static opener you can have is--
"Hey! Dig your profile, you seem like you could be a ton of fun... Or maybe just trouble, I haven't decided yet

"
The reason why this works so well is because it sounds genuine, and it fulfills 2 of the needs everyone woman wants: to be both fun and a little risky. It's a very open statement you will recieve many different responses from. It shows your confident, and an I don't care attitude will make you stand out and take you a very long way. I'm guessing the girls your going after are 9-10's, especially on a dating site like pof, to me this is a bottom barrel dating site, they will recieve a ton of messages from afc's showing no high value, either coming off as too nice, kissing ass saying how hot they are, being awkward trying to be funny, or just being a complete creep coming off as too dirty and perverted. Every woman has a dirty mind and at the same time they don't want to be looked at as easy. I can break any woman down in a matter of 10 minutes and have them eating out of my hand using my openers like this.
This opener shows you have value and don't have a problem showing your status. You know who you are and know who she is. Your on a higher level than her at this point so now its her jog to impress you, not the other way around.
"Dig your profile" shows interest in her
"You look like you could be a ton of fun" she may be fun and she has to prove your doubt
"Or you may be trouble" could lead two different directions, could be sexual, or could be saying that you might leave, unlike other guys who creep around to impress her
"I haven't decided yet" this is the best part of the entire opener, it shows your in control of this convo, and u may leave if you don't hear what you want. Other guys like I said, like at clubs, will linger and linger, trying to keep her interested but push her away, and your showing you don't care, u may leave at any point which gives her the chance to miss out on u.
I know that was kind of all over the place but I'm doing 3 things as I'm doing this lol
Your gonna have 3 different types of responses
The good
The average
And the ugly
The good is something like "I'm a little both" a very sexual response "I'm not trouble, I'm a ton of fun" showing she's interested in showing how fun she is. Both working for your approval.
On I'm a little of both I always respond with both could be a lot of fun

u better not disappoint me :p Let her respond and then move on to other parts of your game.
For the just fun response say you better not disappoint me

let her respond then move on to the rest of her game
The average is "lol thanx" or just an lol or
I just say you better not disappoint me

and let them respond. If the ask why or how just say that average girls can't keep up with u. A playful neg.
The ugly would be something like "I'm not trading pics" "I'm not a whore" or anything showing her Bitch wall. You can very easily break this down saying "flattered that's not what I meant. You obviously didn't read my profile, it shows I'm not like those awkward chumps on here. I was saying you look like a fun person to be around, your the one who made it something its not.
This is a cat and string game, how a cat will Chase a string until he gets it, then just walk away. Let the lames Chase her while she chases you. Be the string not the cat.