You're never going to get that 10 deep feeling in the finals no matter where they are held.
Yeah, it would be great to fill whatever stadium the games are played at. But 7,000 people are 7,000 people regardless if there are 15,000 empty seats behind them or 45,000. The fans always move down close to the field anyway, so they are sitting roughly the same distance from the teams regardless where the games are played.
If you're playing or coaching in the finals, I'd think your biggest memories would be from what happens on the field...not behind you in the stands.