CSGO-Shop may come across as slightly confusing for someone who has not gambled skins before. The website requires that players deposit their skins for which they receive a cash value which based on current STEAM prices. That money can then be used to gamble in a bid to acquire other skins and weapons.
If you don’t have a suitable skin, the service has a multiplier feature which allows players to deposit money and then add up to a 10x multiplier. However, if you win the company will charge you a 10% commission. Though adding ‘csgo-shop.pro’ to your nickname will reduce the commission to 8%. It is important to note that the website is currently in beta and the customer service is nearly non-existent. So, it’s probably not a good idea to use your high value skins here.