Comment Re:It not very hard (Score 2) 167
That's not completely true. Millions of people around the world paying small amounts of money for iOS apps shows that it can be done. Additionally, I signed up for a $1.29/month charge for an extra 20G of iCloud storage, and it was extremely easy.
If Apple can figure it out, why can't spotify? Or is the 'enter your credit card' details step the part that you indirectly refer to as difficult? If so, then sure, there's no easy way of charging people a small amount of money without requiring and storing credit card details. If you can get people's credit card details, then what's the problem?
Of course, once you've launched a free service - and rightly or wrongly people really do expect free stuff - it's rather hard to convert that into a 'pay' service without losing a large percentage of your user base.