The government incentives are certainly there but like you have already pointed out the culture is vital and sadly absent here (London,UK). It also feels like there is no money here either. When it does come, it's paltry and requires you to give up so much control.If we had a few successful high profile exits, talented engineers working for the Banks and Media companies may be more willing to take the risk. As it stands, I know few people willing to leave their cushy 6 figure salaries.