The reason is because it so much easier to sell the non-foil promo cards, so most players are aiming to earn 18-20 tickets, and even if you earned 20 on Day 1, getting another 70 is a tall feat, unless you have a way of combining tickets with friends/teammates
Moreover, you have to pay attention to the risks of non-inkable cards - bottom some of them if your opening hand has more than two, and avoid aggressive mulligans if your deck runs too many (say, more than 25 percent) non-inkable cards
Osik: Every Disney Lorcana card rarity has a use, whether it's a common or legendary card
Iconic cards are the rarest rarity in Lorcana, even rarer than Enchanted
Different Lorcana Card Types Explained: In Lorcana there are a couple of different card types that mostly follow the same rules, however have features that separate them from one another