cryptos take money in exchange?

[absou1ut]

I was playing on Ukbetting today so I had to deposit and convert to GBP so I entered 55 GBP to be taken out. I then sat down at a USD table and I saw the max I could sit down with at a limit table as $100.24, so no problem and I wrote it down into my stats stuff. Later on I checked neteller to see if one of my cashouts came through and I noticed that Ukbetting really took out $102.19, so do they use two difference values for the currency exchange or what? I would assume they use the same for the day and it changes at the beginning of each day?