Translation:Computers are very expensive.
Yes, I do indeed agree with your translation. It's ultimately up to the team to whether they want to add this translation or not and the best way to do this is by clicking "Report a problem". The team periodically sorts through these reports and is able to go in and add alternate translations as they wish. For now, I'll file the necessary reports and we'll see what happens.
An υπολογιστής is a calculator -- a person or thing that calculates.
So ηλεκτρονικός υπολογιστής is clearer, showing that you are referring neither to a person, nor to an abacus, nor to a pocket calculator, but to a computer.
On signs, it's often abbreviated to "Η/Υ".
very = πολύ. Αρκετά=enough, quite https://el.glosbe.com/el/en/%CE%B1%CF%81%CE%BA%CE%B5%CF%84%CE%AC