I've been there, sitting at my computer refreshing like crazy and still watching everything disappear. The real trick is hitting up the venue's own website or box office directly instead of Ticketmaster - they sometimes have separate inventory and way fewer bots hammering them at once. Also try getting on the artist's official fan club or mailing list before the sale, since they usually get early access or dedicated presales with better stock. If you're flexible on dates, go for the later shows on the tour run rather than opening night, since those tend to open up more seats and sit longer before selling out.