Sure, here are some RPG games that are not Gacha-based and do not require much spending:
1. The Witcher 3: Wild Hunt - This is a critically acclaimed open-world RPG that offers a vast and immersive world with dynamic characters, compelling storylines, and challenging gameplay. It is a single-player game that doesn't require any in-app purchases or microtransactions.
2. Dragon Quest XI - This is a classic JRPG that offers a captivating story, colorful characters, and fun turn-based combat. It is a single-player game that doesn't require any additional spending.
3. Persona 5 - This is a stylish JRPG that offers an engaging storyline, well-developed characters, and turn-based combat. It is a single-player game that doesn't require any in-app purchases or microtransactions.
4. Divinity: Original Sin 2 - This is a highly acclaimed RPG that offers a rich and complex world, deeply customizable characters, and tactical turn-based combat. It is a single-player or multiplayer game that doesn't require any additional spending.
5. Chrono Trigger - This is a classic RPG that offers a timeless story, memorable characters, and innovative gameplay. It is a single-player game that doesn't require any in-app purchases or microtransactions.
I hope this helps! Let me know if you have any further questions.