Plugins for $5.00 or less might as well be free IMO. IMO the reason is that alot of people wont even bother messing with a sale of less than $5.00, its more paperwork and hassle than its worth. And once the merchant takes their cut of the sale then its really better to just do it for free.
The only time i have ever in my life bought anything online less than $5.00 was a wristband for $.60 including shipping. And the whole time im doing the process im thinking why am i doing this for a measley .60 cents. But i really needed the product and it turned out to be exactly what i needed.
I know that when i price my plugins i do so thinking of long term relationships in mind. I think about if its something i should offer as a "loss leader"
https://en.wikipedia.org/wiki/Loss_leader
in the hope that other sales develope from it.
I also think about long term income, is this something that can be around for awhile and can provide income over the long term at a lower price, or is this a feature that is here today and gone tomorrow. This effects the price because eventually if the feature is no longer needed it will have to be offered for free at some point because sales are very limited at such time.
So "if" im going to charge for it, i start at $6.00 and go up from there. I will be quite blunt and honest here, i wish i had known my GIF uploader was going to be as popular as it has been because i would have liked to have alittle bit for it. If i had even gotten alittle for it, i would be in a whole different place financially and could offer even better prices on my stuff now. But on the other side of that coin, that loss leader did eventually turn into new sales and it does make me happy that people really like it. So i consider that fact as well.
Some of my plugins were not that hard to do, and some of them were incredibly difficult for me to accomplish and took a long time because im not the same quick thinker and good at seeing things from 30,000 feet as i used to be. And i also price those accordingly.
Thats much of how i do it..
Yes SD i know thats why alot of devs leave the store, they lose money.