General questions about CPA offers

I am using content locking as my method. Now as everyone knows email submits convert the best. I am wondering if certian types of submits convert better or are they generally the same.
For example are the ones that allow gateway/content locking easier to convert as opposed to ones that don't allow it (keep in mind i am blanking reffers)
Basically I am trying to find which type of email offers mostly convert on the 1st page. ( i know its different for every network but i am speaking in general)

From my short experience thus far, gaming email submits have converted better for me.
Offer for like Call of Duty, Halo 4, etc.

They are generally the same, so what you should focus on, is not being too aggressive in your content locker pitch, so people will do the survey and go past the first page, so this will back out for the advertiser more.

If you are only going at them to do the first page, then eventually you will start getting shaved and your epc will start to go down.

Okay thanks chipmunk. I kinda thought the same. Thanks for confirming that.