What's the profit for the EVE players?

I think you're underestimating the size of the "small" turrets in EVE. Take a look at this picture of a Rifter. Take note of the turrets.

Now compare it to this.

Look how freaking huge those turrets are! The barrels are at least 125mm! That's over four times the size of the Gau-8 avenger, the giant freaking cannon mounted on the front of the A-10. And the rifter will have three of them.

No, man, you don't want to screw with EVE ships close up. Be glad they can only shoot at us periodically, and from far away..

Possible Reasons :
1)Defend their investment
2)Maybe allow their ships to loot infantry items or other items like resources
3)If it is a PvE engagement, give them a reward for helping
4)Bounty reward for killing rogue drones in PvE engagement
5)Allow them to salvage wrecks for extra rewards(vehicle wrecks would not vanish and maybe also turrets)
6)Allow planetary incursions and isk and item rewards for eve and dust 514 players
7)contract from a merc

I did a little brainstorming and i most want to see planetary incursions.

I don't think a lot of Dust players realize what kind of game EVE is. There is no directly controlling your ship like a flight simulator, you just pick a direction and hit "go over there at this speed". Guns are directly player controlled either, you just lock onto a target and the guns keep shooting till you tell them to stop.

If EVE was an actual space flight simulator...maybe. But they're not going to drastically change the entire gameplay mechanic of EVE just to add a game mode to Dust. You want a game mode where EVE players lock onto something and fire? Go play a Corp Match.

So the EVE players fly in circles, lock the cannons, and just endlessly bombard the orbital batteries the whole match?

So what are the limitations of inserting mercenaries? Set spawn points?

I am. Those are not small turrets that you would expect to find on a Rifter...
Get more accurate images.

There should be another way to destroying those ships instead of using those turrents. like using fighter jets to destroy them face to face and also, using them against the enemies turrents.