Dolterosal

Not access any official or VAC-secured servers
Not have an inventory, even with actual CS:GO items in your inventory, and:
Only access insecure servers or play offline.

Buying skins is better than opening cases, because you know what you get for your money.

Not buying skins, cases or key will save you a lot of money.

But in the end it's your choice what to do

Dont nit pick its really the same thing when it comes to computer gaming