Was that a sarcastic remark?
I don't need you (or anyone else) to tell me when to leave and a "good bye" remark is pure sarcasm given that we don't know each other and whether I leave or don't is of no importance to you.
All my GB's (15 of them) are tailored toward forge points, battle strength and soldiers, and Goods. There are absolutely no other buildings that I want, need or desire.
I have 13 supply buildings with 9 of them being of Venus. The reason I put them up is because since I got into Mars, supplies were greatly needed to finish quests. (even daily quests) but now I have 1.1 billion supplies. I don't take them down because supplies are always needed for just about everything but then again, I don't need (or can use) more supplies or supply buildings. I would exchange a few of them if I had buildings to replace them with but there are no buildings whatsoever that I want to replace them with. None available in the game anymore. I have them all, the ones I need or want. I do every event and usually (not every time but mostly), I do install the building in the event into my city. But only do that when the building offers more military stength (supplies and coins and even forge points are no longer needed or useful). My only thrust right now is to get more defense and offense. By the same token, I very rarely get attacked and I don't like to attack other players either, especially since there is little to obtain with the attack (more coins, supplies, forge points or medals). As it is, I don't even need knowledge or strategy to fight anymore since I am already strong enough to repel almost anything (except the very strongest) with auto battle. That scenario perhaps occurs 10% or less and I can just avoid those without it causing any problem.
There really isn't anything new to "shoot for". It is just repetive to the nth degree with absolutely no goals left to achieve.