I cannot place a permanent colony there in order to attack that coordinate.
And how exactly it is a problem of other players? It's a widely used strategy to keep all the slots in the nearest islands just for this very reason - to not let enemy build up closely. No matter of allowed numbers per island. It looks like someone again is looking only through a very narrow perspective, thinking only about personal gain and problems.
This whole strategy turns into a race in mining resources. It just makes the battles meaningless. It makes senseless those crazy nights when you catch someone trying to raise a residence level but you catch them and start a battle 3-4 days for this resource for residence makes all this thrill of fighting for tactics that ikariam creates in the player.
If you just want to imagine when someone decides to attack this player. The first option is to log in through his multi account but most often what happens is a quick colossus and then a vacation of the multi account. The second option is to attack the main account then follows a new colossus and vacation. Once this player starts to prepare he buys an army and waits for you to come, well you get together with friends and go to beat him and he what is he doing well colossus and vacation.Then what happens this player buys more army and takes gold from multi accounts through trading and you do the same. And it keeps repeating and repeating the whole situation until finally you get tired of the game and leave the game or just decide to become a farmer too. It's just that the situation is very ugly. Something has to happen either to stop this black market or to start controlling the holiday mod