i choose number 5 but i do have collect cryptocoins for example btc/eth through development services such as create wallet, pool, coin, fix issues and others
5. Buying when extra money around, spending coins when finding stuff to buy via BTC and getting a better price, having a stash that I won't sell till I really feel the need to get out and one that I might sell earlier to cover some big buy (change of house, new car, etc etc).