I won't walk, I'll run away from games that employ strategies like this in the future. I got into a browser game a few years ago called Travian that promised to be "free" and you could buy "gold" if you wanted extras like instant builds or NPC merchant trading or +25% resource production boosts. I quickly realized that if you wanted to be in the top 500 players on a server of about 1500 active players you HAD to buy and use gold or else there was no way to keep up. I got so addicted to it that rather than wait 15 minutes for a resource to build I'd just insta-build it so I could move on to the next building level.
The problem was that by abstracting the currency it made it far easier to spend out of control. You'd pay $25 for 600 gold (~4 cents for each piece of gold) and you'd spend 3 gold (12 cents) to NPC trade, 2 gold (8 cents) to instabuild your queue of up to 2 things at a time (if you had the "plus" feature which added the queue for 15 gold (60 cents) a week), 5 gold x 4 (80 cents) to boost production of iron, wood, clay, and wheat, 3 gold x 2 (24 cents) to boost attack and defense bonuses by 10%, etc. The NPC trading was by far the worst money sink since it was so easy to abuse. You *could* trade with normal players, but nobody really does past the first few weeks of game play (the game round lasts a year) since it is impractical to try and find a trade for tens of thousands of resources... so you NPC trade it instantly for 3 gold (12 cents).
So, at a minimum you'd spend $6.56 a month for the Travian Plus feature plus +25% resource boosts, +10% offensive and defensive bonuses. That at first seems reasonable for running such a cool game, but I was averaging around $100 a month on gold because of NPC trading and instabuilding. My coworker had it worse because his two sons were playing and he was even worse with the instabuilding. His monthly Travian habit, including his two sons' costs were running him around $300/month. FOR A GAME!
So no thanks, I'll take a $15/month subscription fee ANY DAY over a microtransaction arrangement where you need to eventually spend obscene amounts of money just to be in the top players.