Thanks for the reply. I got to explore the PeakMonsters feature. And maybe the market rent prices doesn't treat some of my cards well, even if they're a bit leveled up. Two of the 'unpopular' cards that I was mulling over were Serpentine Soldier and Clay Golem. These were the top 2 cards for Best CP/DEC ratio. Good for rentees, not so good for renters haha.
I'll go analyze my cards some more. And also from a rentee's POV as I plan to grow my account into the next league. This tool is incredibly helpful. I only discovered it thanks to your post!
I made a new post based on your comment! Thanks for the inspiration and I hope it helps with some more insight and tools.
Markets Within Markets ~ Diving Into Splinterlands Rental Markets Using PeakMonsters