● you will NOT have the right to vote or participate in consultative processes or at General Assembly*
● you will NOT have preferential rights in the purchase of tickets either for home or away tickets, nor will you be able to participate in draws for tickets for finals
● you will NOT be able to have a season ticket for the Nou Camp or the Palau Blaugrana, nor will you be able to put your name down on any waiting list for these tickets - you will NOT be able to take part in the Llotja Oberta (Presidential Box) draw
So no preferential rights for HOME games too, the discount is rather nothing considering for someone who has to travel, the 5-10% difference isn't any big difference and also you can't really get your money worth after paying for the actual card, so chances you get a ticket at a SF with Bayern or a El Clasico without full membership seem 0, which are one of the main reasons people want to members anyway, not to mention Finals.
As for June-October, Supercopa is totally the least important trophy, Gamper is like the least interesting game of the whole season and recently you only get too see more of the B-Team, all you have is some games at the beginning of the season, even back in 2006 when I was at the 4-0 with Bayern I only got to see half a match of the first team, even so, nothing more special than the Dinamo-Barca from this summer when the deal was for the team to use the first team in the match, especially Messi. And anyway, no friendly can fight a real game, even if it's Barca-Man U Friendly vs. a Barca-Betis in La Liga for example.