I have bought items from TrainZ for some years now and so far I am very pleased with all purchases. One item that was Doa, they paid for the return and fixed it and sent it back within a week. No problems since.
If your buying early MTH you must know what your getting if made from 2000-20005 it is 5 volt, avoid it.
I only buy older items because I just cannot afford what is being sold today especially from Lionel and MTH. MTH/RK scale are a great buy for new proto3 locomotives!! Not allot of prototypes but what they have is well worth a look!
As far as getting people to be more honest in their selling, descriptions is like finding a honest politician. Most likely will not happen.
What you have to do is know what your buying and holding the seller if it is misrepresented. Also buyers who misrepresent what they got or don't understand what was sold to them.
Here is my list when I decide to buy
Known seller
Friend
Known dealer
Great pictures
At a show like Allentown or York and only from a dealer I know or recommended!!
Always be careful, trust almost no one, have fun,
Dave