I agree. Truth be told I've seen rates all over the place. Seen one guy who noted a starting price of $60 for all customs. Before figuring in parts and sculpt and whatnot. Another had a starting rate of $80. Of course, there was also a guy I heard once that charged upwards of $150 just for a repaint with parts provided. It can definitely be hard to gauge. I personally do a starting rate of $40. Of course, I work in 3 3/4". And that's my straight repaint price. Building off of the typical $10 cost for each figure these days.
And yes, there will always be someone to complain about the price. I've even been asked if I'll take cheaper for my EBay listings, which all start at $40. Had someone message me once and say a figure that size wasn't worth near $40. lol It happens. But, there's always someone who think it's worth the price. Been asked to make a figure and name my price a couple times. lol So yeah, just figure up what you think your time is worth and give it a shot. Everyone has their only methods and opinions. It may take a little trial and error, but you'll finally settle into something you like. Mine were all over the place for a while. lol