I agree with the points raised by Hatebi and I just want to highlight the disincentives at play. There are two ways to nuke turret; with a nuke stockpile and without a nuke stockpile. When we nuked TKR we had stockpiled nukes for over 3 months. Many of us had over 100 nukes and missiles. The cost of purchasing and maintaining all these nukes was very high. We spent over half of the would-be alliance-wide income on nuke and missile upkeep. Not to mention the cost of the weapons themselves. All of this, just to have 3 nukes spied away every day. We were still able to launch at least 5 nukes daily, but it's not great with regards to the ratio of money spent and damage dealt.
Nuking without a stockpile can be a lot more economically viable, as it can be performed without months of paying billions in upkeep. You will, however, not be able to do the same amount of damage in the same amount of time. There is also the need to manage your resource stockpile such that you can afford a nuke (or two now that we have new projects) every day. This requires more effort and planning from individual members than mindlessly throwing 5 nukes every day, and will consequently be harder for an entire alliance to keep up for longer than a month or two.