You have to convince someone to dig out their credit card to pay you money. There is essentially no differentiation between $3 and $9 at that point, since neither amount is an appreciable amount of money to working professionals.
For a once-off purchase, I totally agree. For a subscription, there's a big difference there.
I know not everyone's like me but I tend to calculate the annual price for subscriptions I have. So even though I almost never use it now, paying $1.99 to the Problogger forum is no big deal. But $9.99? That'd be a $23.88 vs $119.88 - a pretty wide gap. There are lots of things I wouldn't spend $9.99 a month on something that I'd spend $4.99 a month on.. a flowcharting app might well be one of those things.
For a once-off purchase, I totally agree. For a subscription, there's a big difference there.
I know not everyone's like me but I tend to calculate the annual price for subscriptions I have. So even though I almost never use it now, paying $1.99 to the Problogger forum is no big deal. But $9.99? That'd be a $23.88 vs $119.88 - a pretty wide gap. There are lots of things I wouldn't spend $9.99 a month on something that I'd spend $4.99 a month on.. a flowcharting app might well be one of those things.