Linus says, he bought a PC after VIC-20 and Sinclair, in order to not write software he needs himself, but to work on a supported platform which has a community, therefore to be able to buy software written by others, and then he learnt about Unix, and wanted to run Unix at home, he said - “How hard could it be?”, and it turned out he could not, because it was “expensive as hell” and targeted and marketed for banks. (:
https://youtu.be/MShbP3OpASA?t=4m37s
#linus