Yo bro,sorry for the late reply! Glad to read that my post motivated you to finally buythem Axies.

Adventure mode needs some hard grinding but once your Axies reach lvl 20-25 you can spam the Lunacia Ruins lvl 20 and earn 10 SLP for your every win. No Axie is useless so no worries!

Axie is not an easy game so if you love challenging games you're gonna love it!