I've done the math and there are 13 "things" that you can purchase - 4 nests, 2 evolution temples and 7 farms. If you have all 13 and keep them going 24/7 you will have 624 points a day, enough to finish and get all of the personal prizes.
I only have 11 "things" - 3 nests, 1 evolution temple and 7 nests. I can get 528 points per day from them if I'm diligent. I don't have a need for the 2nd temple (I only evolve at 7 & 10 so it's never backed up) but the 4th nest has always been tempting. If I were to finally get the 4th nest, and have 12 "things" running, I can get to 576 a day - then add in 48 points per day for the quest and snowman (I can collect 3 times from each for sure), then I'm at 625 points per day.
I'm heading towards getting that last nest, in the long run it will be cheaper than using gold to speed up breeding/hatching for World Events and Leaderboard and it will help for DT when we have to breed some type of dragon and my nests are held up for days waiting to hatch. I may have just talked myself into the value of having one.