Someone linked a Noxious highlight earlier which I think exemplifies this whole issue really well. The gist of it is that once you open your first 100 or so Kegs, whether that's purchased or F2P, you're essentially buying the Scrap value of 4 commons and 1 rare because you'll have all of the rest. If that $$-to-Scrap ratio doesn't seem good to you, you've gotta realize you're totally gambling and just like any real gamble, you can't validate feelings of unfairness by saying it's rigged... (I mean you can, but it generally isn't true, and you know it)
The more you buy, the quicker you'll reach that stage of 'not getting anymore good cards' and that's to be expected because you skipped the entire process of getting most of the 'new cards' over time from the card pool. Now you're just holding out for epics and legendaries.
And to those claiming you can't be competitive unless you have 4 and 6 insane faction legendaries and silvers, just remember that you start out with enough solid cards to fill out each slot (especially by the time you reach level 10) and that the majority of your deck is composed of bronze cards which is also where your counter and tech cards will lie. Assuming you're gonna beat every deck once you have best in slot cards is a fallacy because you need to be open to constantly adjusting your decks based on what you're facing the most of.
