hey there, i know im not the person you quoted but i went to TITP this year, so i might be able to help
3) i wouldn't recommend buying your tickets for TITP 2015 now, simply because you don't know the lineup. we bought ours pretty much on the day when they released them on general sale (i think around february time? cannot remember) but i know people who bought their TITP 2014 tickets like 3 weeks before the actual festival, they don't really tend to sell out. that said they did sell out in like 2010 within 90 minutes or something
but no you definitely do not have to buy your tickets right now!
hope it helps
i would definitely recommend going, it was my first festival but it was fantastic!