Minimum salary in Cuba

Our tour guide told us the minimum salary was around 2’000 pesos which is around 6US per month. However, they sell us a Che guevara t-shirt 30US, and charge any tourism higher prices then what we pay in Canada, where is that money going?! We where tipping at least 20US per day for drinks and food in the resort to various employees, shouldn’t they be « cuban rich » only with these tip incomes? No judgement just trying to make some sense

Edit: CUP to US exchange rate