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And $10/month subscription? What should something like Photoshop with 10000x the features and development costs then charge? $1000/month? I understand "keeping it simple" but not "keeping it simple AND charging a crazy price for it" (there are essential, complex apps, that charge much less than that). I guess, if you can get away with it...
Price should scale with demand. A company like Adobe might want to maximise revenue, so they price it optimally to make the most money out of their product.
A single developer might not want to support half a billion users at $5. If selling at $60 means a lower number of users and a manageable number of support requests per month, it is a much better idea, even if it means less revenue. And in general, at higher prices you get better quality customers.
Pricing is hard, because it is not intuitive. And more importantly, the value of something is often subjective. People tend to forget that.