It takes about 2 hours to get to Moscow, if I remember correctly (walking to the bus, bus to the commuter train, commuter train to Moscow). So, it makes sense to plan day trips.

I checked the route on Yandex - it doesn't take that long to get to the Bolshevo platform by minibus (but you still have to wait 15-20 minutes for it). Plus, from Bolshevo, you take the commuter train.

Vladivostok: 25k for accommodation + 15k for tickets - a total of at least 40k, excluding alcohol.

Are these tickets for people from Siberia?

3. Financial aspect. I assume that Korolev will be financially somewhere in between Yekaterinburg and Vladivostok.

On average, even if there are 40 people, and each person spends an average of 20,000-25,000 rubles on accommodation, food, and the conference fee, that's at least a million.

A million minimum means the price will be 25k.
Did you read what's on their website? Did you see the keywords or not?
"In the event of a microphone being dropped, the guest must pay a fine of 3,000 rubles (if there is no damage to the microphone's functionality)." I'm translating this into Russian: "we will try to rip you off at every turn, using any legal and illegal means."
The CIS under the motto "Give me three thousand!" is a joke. And next year, I would be very happy to consider Korolev's application.

Rental of additional equipment
No. Equipment Name Cost
1 Portable screen on a tripod (1.70 x 1.70) 500.00/day
2 Projector (2000 Lm) XGA resolution 2000.00/day
3 Radio microphone, amplifier, mixing console, technical support 4000.00/day