These are all descriptions. I don't think they are meant to mislead. But some collectors do have an inflated view of the value of their items. For example, when someone sees nothing but rebuilt mismatched k98 on the market and one days comes across one that is almost all matching except for a single part, it is indeed a rarer find and he will probably be very excited about it. But collector-wise and value-wise its not worth more at all.
Want to look at creative descriptions? Real estate market. "tastefully decorated", 'spacious", "a steal"... lol.