If you experience flats, especially when they happen repeatedly, you should always look for the cause. Check the inner tube. When you find the hole check that position on the rim as well as the tire. Make sure that there aren't any sharp edges or objects. Don't go too low on pressure. Buy quality tubes and tires from manufacturers like Continental or Schwalbe.

Flats happen and are inevitable, but they should be a rare occurence. As a daily bike commuter and road bike enthusiast I experienced 2 flats in the last 10 years.

Futhermore most maintenance tasks are quite easy to handle and Youtube has excellent tutorials ready. I understand that this isn't for everyone (I'm not interested in learning how to repair my car for instance), but channels like GCN [1] explain a range of basic maintenance taks for anyone who's interested.

I also think your expectations towards bike prices are somewhat unreasonable. Maintenance is required at any price category, but generally 1000 € bikes will give you a decent entry level experience with quality parts that should last for years. Lower priced options will have to cut corners and cause frustations at some point.

[1] https://www.youtube.com/user/globalcyclingnetwork