An express round runs about 7 weeks (little less, unless you actually have a week-long endgame, which I haven't seen on the server where I play), so that's 7 x 150 = 1,050 gold spent on a plus account for the round. I also like using the starter package in era 1 and the era packages for the others, so that's another 125 gold in era 1 and 5 x 250 = 1,250 across the other eras. So without buying lottery tickets or using gold for anything else, that's already 2,425 gold that I'd ideally spend during a given round.
Say what you like about the entry fee, but putting 2,000 gold toward playing a special event server where I'm going to have access to 20,000 over the course of the round... that sounds like fun, and won't cost as much as a "normal" round for me! I'd call that a win, and I'm definitely interested.