I've been playing this game for months now, and for the most part have never encountered any problems with gameplay or the content, until now. The first new mission,Lethal Forces 1, forces you buy a new weapon with in game cash to complete the mission. There's no other option then to spend in game cash to advance through to the next mission. I know the developers of the game need to make money, and I'm sure there are people that spend plenty of money on this game, but I am not one of them. I'm not poor, I have an iPhone obvisously, but I don't plan on spending my hard earned money on a silly video that I play to kill time, no matter how much I like it.
I have played many games that work this same using credits that are purchased to buy content, I have also stopped playing almost all of those as well because they usually get to a point where it seems greed takes over the developers and the only players that get the cool stuff are the ones that line the dev's pockets.
I could earn the in game cash through leveling up, but that will take months to advance 25 levels. Not to mention the fact that it's so easy to waste your money on items because of an errant click on the screen and you just wasted 5 dollars on duct tape to make a Flame Thrower or Molotov Cocktail.
Sure it's easy to click buy and spend a few bucks to complete this mission (who knows what the next mission will cost?), it's just as easy to click the icon then delete.