Think about what you just said

$5 dollars at a time. How many times a month will you do this? This is what the companies are counting on.

That you say "oh well, its only $5"

Except you end up saying that 4 or 5 times a month, guess what you are spending more each month and you really do not realize it. Because it is just $5 at a time. And they constantly add new items you just "must" have for your character.

Me, I would rather pay a flat fee. And pay for expansions periodically.

Have you ever payed one of these micro-transaction games? I have tried several. And I found myself saying heck its just $5, then when I get my credit card bill there like 30/40 dollars charged up that I just did not realize, cause it was not all in one shot. just my 2 cents though.