It comes down to conversion rates from free -> paid users. Is there an itch that your customer must scratch and is willing to pay for ? As long as that motivato

It comes down to conversion rates from free -> paid users. Is there an itch that your customer must scratch and is willing to pay for ? As long as that motivator exists you will see good conversion rates. However if the idea is to sell 'cool' things that add bling to a service / app, it is less likely to sustain profit.