I've been on the IN since mid 2012 and at least in my experience, if you're outside the US or the UK it's pretty much useless because that's where they play the big sold out shows for which you might want to get tickets earlier. I've seen them 3 times and I haven't had a problem with tickets even without the IN presale (one of the shows was the Emirates Stadium one). If you get them the day they start selling them you shouldn't have too many problems. That said, lately many countries are having problems with scalpers, more specifically, other sites which use bots to buy massive amounts of tickets from the original seller and re-sell them at double or triple the price, leaving no regular-priced tickets to the public. From this point of view, I think the IN presale might be a way of making sure you get your ticket without spending over 100$ for it. So I'd say, if you have 15$ or 20$ (I don't remember the exact price) you can spend on a year long membership, go for it.