That I know of there all scams, the only legit ones are paid as in - facebook advertising, adwords... etc
No point requests made by automated system.. What will you get in return? PR? back links? or what? Only thing is that your page hit count will grow.
Yes nvidura is right...........you would only get your traffic count to be high and this is not a good thing...........you will get benefit from it but for just 1 or 2 months it depends on you so i would recommend that do as much backlinking to sites as you could and this is surely going to rank you high!!!