buying money with mystery points is not the best way to get money from mystery points
buying money with 2X gets you 714 coins per point
if you buy (6000-7500 points) and then sell (6666666 coins) items to the mystery set you can from 888-1111 per point
with a little math it is easy to see which one is better
it doesnt matter if you are logged in or not the save files are bound to your computer not your accout (you do get more bonus if you are logged in tho)
you need to make it so you can see the stats of a tree before you buy it
I used to buy a lvl 8 yellow before bed/work so I could get when I woke up or got home but now you cant see how long the tree is going to take or if its worth it before you buy it