What kind of argument is that?  I'm a teacher, I make less than 33k a year.  I am hardly rich by my countries standards (I qualify for social assistance for the love of god).  I buy my BTC through multiple sources.  I also participate on Purse.io so that I actually DO help people in areas who can't buy BTC like me get BTC for rates cheaper than Localbitcoins.com.  

If I concerned myself with every purchase I make, and how that would make someone who can't afford it feel, life wouldn't even be worth living.  I don't reprimand people who make more money than me for buying a nicer car than I can afford... what?