I don't how weird this may seem but my most used cryptocurrency is Ethereum and my major use for it has been gambling, I'm not a gambling addict and I could have my Ethereum for several months or most times even convert my fiats into ETH not and decide not use them, but more often than I used it gamble on decentralized betting platform, and convert into BTC when I'm to gamble on BTC-only accepted platforms.
What would the websites be, or physical places you visit for your purchases?
About 90% of the times when I needed to convert fiat to ETH or BTC has been online, via Luno or Paxful (a peer to peer market place with variety of payment options) respectively, In my country there are not so many physical places where you can trade cash for cryptocurrencies.
I agreed with you with using cryptocurrency as a digital currency for trading purposes I use ethereum for trading binary options I am quite satisfied and fulfilled while avoiding the cumbersome processes of using skrill, PayPal etc.
I also used a decentralized broker where the issue of price manipulation by scamming brokers is a thing of the past while I don't have issues with withdrawal of my crypto funds as well as exchanging it to fiat.