[DeeadPool]

Nope.

Here you go:-

PHP код:

enum PlayerInfo
{
    vehslot
};
new PlayerData[MAX_PLAYERS][PlayerInfo]; 


PHP код:

CMD:vehslot(playerid, parmas[])
{
     if(PlayerData[playerid][vehslot] == 8) return SendClientMessage(playerid, -1, "You already have maximum number of vehicle slots!");
     PlayerData[playerid][vehslot]++;
return 1;
} 


PHP код:

CMD:vehbuy(playerid, parmas[])
{
     new vID;
     if(PlayerData[playerid][vehslot] == 0 ) return SendClientMessage(playerid, -1, "You have no vehicle slots!");
     if(PlayerData[playerid][vehslot] == 8 ) return SendClientMessage(playerid, -1, "You can only own 8 vehicles only!");
     if(sscanf(parmas, "u", vID)) return SendClientMessage(playerid, -1, "/vehslot [vehicleid]");
     if(vID < 400 || vID > 611) return SendClientMessage(playerid, -1, "Invalid vehicle id!");
     if(vID == 520) return SendClientMessage(playerid, -1, "You can not buy this vehicle!");
     
     PlayerData[playerid][vehslot]++;
     SendClientMessage(playerid, -1, "You successfully bought your own vehicle!");
     
     
     
     
return 1;
} 


It's Just an example how you can do it.