I can see where it may be a paid 'boost' to get something more quickly but like others the microtransactions for a full feature full price game are b.s. It's quickly becoming the norm though to nickel and dime people to death, just look at subscription t.v. service.
Broadcast t.v. had commercials to offset the cost of operating paid for by advertisers. Go with a subscription service like cable or satellite and you pay anywhere from $60-$100/mo to access a wider pool of channels still stuffed full of commercials.
So they're getting paid the subscriber fee + the fees from advertising. A good portion of 'all those chans' in a package are 24/7 paid advertising infomercials which equates to more income. Want any movie channels? Pay for them on top of your bill, so you have to pay twice just to get commercial free programming.
Games are getting to be the same way, get you for the cost of the game, then potentially a subscription fee if using a console, plus in game currency for microtransactions. I'd go so far as to bet down the line they'll be charging for the game + a penny for every bullet fired or km walked in game. Hate to even say it out loud and give them any ideas.
Personally no thanks. I'd rather buy a game than perpetually rent it and if they don't offer that option it's as easy as speaking my thoughts by closing my wallet on such titles. Enough people follow suit and they can charge for things all they want.
Last time I checked, 0 x "insert amount charged" still equals $0. Their choice. Maybe it's different for some folks who 'have' to play particular titles. The game co's need people to buy their products, I as a customer don't need to buy anything. They're in no position to dictate to consumers far as I'm concerned.