I've played 2 games in BNW with Sweden (well I'm currently playing one) and it may just be coincidental but when the AI would hit an early wonder that has GPP associated with it like Stonehenge and the Great Library they would immediately as me for a declaration of friendship, meaning that I can sell my lux for 240gold. Am I missing something, is Sweden a good choice to get early lump sum gold or is this coincidental AI behavior?