Wingnut Wings makes the most accurate, well-engineered, easy to build detailed WWI scale models you can buy. I have been building WWI plastic scale models off and on for about sixty years and I stand by that. To do that costs money to research, design, make and test, produce the artwork and the instruction and reference booklet for each. Additionally, Wingnut Wings offers free (which is arguably highly reduced) shipping for their customers. Purchasing these kits is obviously a personal decision based on perceived value. To argue that they are priced too high is also a personal opinion, not shared by a very large number of modelers and to blame Wingnut Wings for that is to insist that they share your personal values.
It would also appear that with the thousands of kits shipped around the planet, they are doing a fantastic job of it especailly since once the kit leaves their warehouse, they are no long in control of its destiny.
It appears to me that because some think that the later Wingnut Wings kits are priced too high and that some have experienced shipping or postal issues for kits that have to travel thousands of miles across various bureaucratic processes, Wingnut Wings is now a favroite target for complaint.
I have no complaints except that I can't buy all of the kits I would like to have, but that's not Wingnut Wings's fault.