Seems a person who goes by the name of "eBay Seller" would WANT the exact scenario you describe.
In other words, if by "ruined everything" you mean those [sic] "moeny-spending engineers", are helping you achieve higher profit margins, then by all means, ruin away!!
eBay Seller said, "Bottom line Freddy. You have to pay dearly! No two ways about it." Don't believe it Freddy! I have accumulated many, many, more HP's from garage sales, thrift stores, classified ads, etc.. than I have ever bought on eBay (three total, all less than $60.. 32S 50th. Anniversay edition, and 41C Blanknut, for example).
In fact, I picked up a pristine 11C for a whopping $3.99 at Goodwill yesterday. What made me laugh was that the $19.99 to $39.99 Sharp, TI, and Casio calculators were behind a glass display case because they were "valuable", while the lowly 11C was loose and alone in a bin, separated from it's case (in a different bin). Sorry, the 11C isn't for sale.
Matt Kernal, a patient and frugal "moeny-spending engineer"