How to get a key in a 'few' simple steps

Hello everyone, not a news-related raffle this time. 
I suppose this won't break the economy, so I might as well not keep it to myself, that would quite suck.I don't remember anyone talking about this, which is weird, but pretty understandable, given it’s not easy to discover that by yourself. 

There is, as a matter of fact, a really simple way to get about 1 to 2 keys in TF2, and it can be done thanks to these 2 words:Blood Money.
Now, I know some people may have forgotten what it is, so time for a recap.

Premium players have access to the Mercenary Park contracts, in addition to the Pyroland contracts everyone (both Premiums and F2P) has. With some contracts you can earn 5 cosmetics, 3 special War Paint Cases, and the Dragon Slayer War Paint, but the reward behind most contracts is Blood Money. With said money, you can buy War Paints, Cases, and most importantly here, Crates.

Long story short, my curiosity led me to finding out those crates are pretty damn expensive. On backpack.tf, the Jungle Jackpot crates are worth around 25 Ref, and the Infernal Reward crates around 30 Ref. 
Moreover, I have also found out, after a bit of research, that out of all the war paints you can buy, it's the Civic Duty that has the best Ref/Blood Money ratio. 
And all that ultimately leads me to my instructions to get said keys:
1- Complete your contracts (I did say it was simple, not that it was easy)
2-Buy 2 of each crate with your Blood Money (the maximum amount you can buy)
3-Buy as many Civic Duty War Paints ad you can
4-Sell all that for Refined Metal
5-Buy keys 

Granted, I know it's not enough to buy an Unusual, but it can help you buy some cosmetics, or some Strange items.  

All eyes on me!
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