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Easy, make r12 kurz/lux count as max title when you get it towards kind of a big deal and Hall Of Monuments. But make r15 posible as an extra for a lot of people that likes to keep playing AB/FA/JQ/MQSC/Deep/Urgoz... that they are quite a lot. There would be even more fun games since people will be more motivated towards it. I dont see how it could harm the game, but make it more fun. Making 10Millions was hard in 2007, making 10M nowadays... its really easy (and if you have been playing 10 years i doubt you dont have it), not even comparable to getting any of the other max pvp ranks.
Global Looking For Group, wasnt that necessary back then when there was 5 district in temple of ages, 2 districts in XXX etc... nowadays that there are not that amount of population, but people still wanting to play would fit much more. You cant just go into one city and wait 3 hours to play something.
GW Vanilla, eeemmm... World of Warcraft have had 15 years of active game development, so there is much more things and some differences between the game we have today and Classic WoW. GW Pretty much stoped development in 2007. The game is already vanilla and could be promoted as its already with some updates.
Shop collector edition codes. The game is 15 years old... do you prefer having people buying these stuff on Amazon, or giving that money to Arenanet via Shop? idk...
PD: And the new pvp mode i suggested is already done. (with unique maps and mechanics that you cant find in any other mode)