The really sad irony of Dead Space 3 is that if I'm fed up with the game's slow vanilla speed of resource collection, I don't have to pony up cash for a resource pack. I can - but if I'm a PC gamer, I can simply use a trainer and supercharge my resource values. Ergo, absolutely no need to pay for more than the initial sixtyburger.
On the flipside of things, there's Blacklight, DOTA 2 and Team Fortress 2. Blacklight and TF2 each start you out with an adequate arsenal, and the game isn't so woefully unbalanced as to more or less demand that you hork up more cash. I've never purchased a single thing for TF2, working exclusively with my item drops and my rare crafted items, and I'm doing just fine. I know newcomers who work with the vanilla loadout for each character and who do quite well, actually.
DOTA 2 does things even better, as purchasing items is purely cosmetic in nature. You aren't paying to get a leg-up, you're essentially paying to show your appreciation to both Valve and the custom content creators that end up featured as part of the game's store of purchasable items. That's the kind of price I'm willing to consider, as it's more a donation or thanks being given than you trying to pay your way past the metaphorical gatekeeper of the Land of Decent Kill/Death Statistics.
For those that suck... Planetside 2 is a horrid case of that. You absolutely can play the game in its barest form without paying a dime, but two thirds of the essential features are locked out, and the complete loadout remains something that's just *there*, teasing you with upgraded stats.
Then there's World of Warcraft. I really don't know that the core game's expansions warrant additional charges of twenty bucks per purchase, on top of my fifteen bucks per month. Most other studios release huge content patches or updates for free, so why doesn't Blizzard do that, other than to have an excuse to suck at our wallets a tad more?
In any case, if I ever get into WoW, don't expect me to buy the whole kit and kaboodle in one fell swoop. I'm more liable to stick with 'nilla WoW and work my way through that, and *then* buy the expansions, one after the other.