300 is for the best reward.
100 = card
200 = ticket (last time e-gacha)
300 = ticket (last time SR gacha)
I didn't make it to 300 last time, but I got 260 or so. It was enough to get the card and the e-gacha ticket. Mostly, I just wanted the rewards. Even if you only poke a SEG, you get 2 rewards, and SEGs drop the best rewards. They don't ALWAYS drop them, but you can get better rewards from a SEG than you can get with regular EG.
And yes, Rage is the king of SEG hunting. It's so very nice to have him on my friends list. I may as well give shout outs to a few awesome people. @Tomaa, @Mithril, @Chillinfar, @Christofor, @Arekusu, @AYHIDRION, and @Massume took care of most of my SEGs and/or shared a bunch.
They're all super great people to have on your list. I would not have gotten even CLOSE to 200+ SEGs without them.