Try reading comprehension first. I said F2P conversions. Not titles that launch F2P. And nowhere in my statement did I claim it was triple revenues for only one month. I meant that a F2P game is going to have a cycle of new players trying out the game for 1-2 months, spending a nominal amount of money, then moving on. But there is a large potential pool of those people, so you could maintain a pretty steady revenue off of that. Whereas once a sub cancels they're probably gone forever.
LOTRO sub numbers show them at around 220k before F2P then doubling and slowly declining since then.
GW2 ... it's been out less than a year and launched F2P. A Google search on GW2 revenues comes up with nothing other than the articles post-launch talking about revenues from initial box sales. Where did you get your info from about "healthy profits"? We'll have to wait for Q2 financials to be posted to possibly see what kind of revenues they're actually making off the game.
The content releases for GW2 have certainly been underwhelming since then. A handful of new story events, and Fractals. Thats it.