it is most certainly all about the energy and vibe. i went to see UFN18 in Nashville and was in the first elevated section. It wasnt too hard to see. A couple of pieces of advice from an autograph junkie: grab a shirt and a sharpie and go to the weigh ins. also have a shirt and a sharpie at the event. i met a ton of fighters/refs/Stitch at the event in nashville as they were just walking around. they were all super cool.(cept Mario Yamasaki for some reason was total a cock sucker) and most of the time all the fighters stay at the same hotel. if you can find out which hotel that is, a couple hours before and directly after the event its a great place to get autographs.
.... not sure if youre really "into" the meet in greet thing, but its probly 50% of the reason i spend hundreds on a single ticket. ive been to 1 UFC event and the weigh ins for Strikeforce Nashville, got tons of autographs and pics at both.