Is 10 gems not on par with a classic refill? I've never bought one. Honestly, don't see them getting any cheaper, clearly (based on leaderboard showing matches completed) some are buying :)
I could see Plarium throwing more free refills in the short term to accelerate the player distribution across tiers, but prices only go up in this game (and pretty much everywhere) lol. More free now, and higher costs long term aligns with Plarium/casino strategy and is good business acumen imo.