A lot of assumptions going on in this comment. You should actually consider testing some of them to see if they're true or just mistakes on your part.
Putting that aside: developers who do this kind of (difficult, tedious and thankless) work are entitled to ask compensation for their effort, on top of everything else they do for free.
Putting that aside: developers who do this kind of (difficult, tedious and thankless) work are entitled to ask compensation for their effort, on top of everything else they do for free.