Sure and i could also PM you and ask for your BTC address, internet existed before webbrowsers, and phones before iPhone, but ...
I think the point here is a prove of concept and expose is to wide adoption (meaning being user friendly) as much as to encourage quality posts. If btc forum can't integrate user friendly BTC tipping, you really expect other forums adopting it?
Every account has a place in their profile for a BTC address, and many people have something in their signature that mentions they can send tips to a certain address if they liked their post.
As it was mentioned above, there is no real need to integrate a 3rd party app for any bitcoin payment, tipping included