Is it a trick?

A week ago, I spent all the gold coins given by Haypi's Activities, since then I hadn'tt seen any adv skill books at all till I almost forgot how they look like.

Until today, I purchased the coins and start to see the adv books coming back. Totally, I saw 3-4 adv books today since purchased and still have few challenges to do. Is it a trick to have golden coins in our account to increase a chance to see the adv book?

Or is it just me?

I think it's random.

Like for a few consecutive days, you'd see a lot books.

Then following several days, no books.

S on and so forth.

lol i dont think it's a trick

it's just sometimes you are lucky you'll get 2 or more books on a spin sometimes it will all just be crystals.

one more thing, after I received the $100 coins from the activity, each day I saw about 4-5 adv books chests and often the first spin it didn't land on the chest, but the second or third. (I basically wont re-spin more than twice)

IMO, It is a bit skeptical for me