It is a mistake to compare the price of the card to the computer though. That is like saying you would not buy a Ferrari with one flat tire for 10 EUR because buying a new tire would cost several times what the car is priced at.
The important thing is the total cost of ownership.
If you add everything up, do you get an amount that you are comfortable with? Are you fine with spending 100 EUR on a complete computer? If yes, then just go for it.
