Yes you say true about make account harder for exchanges they want some documant for confirmation , it was not like that before, i think they need documant for security for users .
Verification of documents is a good thing and it is something for our own safety. On the other hand, as far as buying of Bitcoin is concerned I think there is hardly any problem in buying as many Bitcoins as you want to buy. The only thing you need to have is enough amount of resources and thats all.