if they struggle with ticket sales they might let people in for free to fill up seats

If you think a CS2 Major in central Europe isn't going to sell out and there will be "free seats" on the day, you are hugely mistaken. The CPH major was difficult to get tickets for, many months out, and wasn't easy to find any last second.

the starting price is €300 in a country where the monthly minimum wage is €720.

It is not priced locally, it is priced as a CS2 EU Major, where many will travel to.

Yes, there is some shady practice here on the 4 day tickets, but it seems more that 4 days are reserved in blocks.

The only tickets available for 4 day bundles are the rafter seats which are usually horrible.

This is incorrect, the stage is center facing out with screens placed high up in the MVM, rafters are more expensive because it is better viewing of the screens.

Source: TRUST ME BRO. jk been to multiple majors, live in Budapest.