
There are many ways to earn 75kt a day, but I've found the Runestones of the Arcanist is the easiest, fastest, and least boring way. Bonus, since it's a memory game, maybe it's helping train the brain to have better short term memory (haha but doubt it). I've read a lot of good guides about Fairgrounds, but none seem to specialize in Runestones and they often underestimate the treasure gotten. So, after having had Dominance the very second week I joined FR, I played Runestones like a crazy person and as a result, got to expand my lair from Lesser to Mighty. Along the way, I came up with some tricks that work well for grinding there. To see just the Runestones guide, go straight to guide. To see the 75kt process that involves Fairgrounds only, keep reading.
Step 1 - Go to Higher or Lower (also in Fairgrounds) and usually get 1,000t out of that easy. How easy? You just have to remember the dreaded math and think about basic probabilities. At first glance it looks like you have a 50/50 shot at guessing if the number is higher or lower, but that is deceiving. I'm pretty sure your options are only 1-13 so go with whatever will give you the highest chance. Any number they display 2-6 --> I always choose higher, and any number they give 7-12 --> I always choose lower. After you're done, make note of when you can play again and interrupt your Runes time to play it, and then go back.
Step 2 - Go to Baldwin to transmute 1 item - this gives you a reference for how long you've been grinding and gives you a material in the process. Usually I like to do around 30 minute sessions which is how long it takes to transmute something. After your 30 min session is up, you should have around 21kt (counting Higher or Lower too).
Step 3 - Finally! Go to Runestones and let the grinding commence! Some Fairgrounds guides say you can only make 1,700t in 8 levels, but that's a low estimate. I always make about 2,000t going from Level 1 through Level 8. Random note: I find it's less distracting to turn off the music/sound effects and just play your favorite classical/non-vocal music in the background.
Step 4 - Take a break for your hard work and rinse and repeat whenever you feel need the treasure :)