Dear Dennis,
The outrageous selling price of a few motors on ebay is absolutely NO INDICATION of the market. Do you really need a NIP RR-1 for $500???
Do you really need a NIB Venom for $250?? Granted, you will pay more for nib or nip vintage or nostalgia engines, but Babe Bee's average~ $25 Black Widows average ~ $40 & TD's up to ~$85. There are so many hundred thousand motors out there that there will NEVER be a shortage of these (reasonable costing) engines or spares. What you don't realize is that a number of these high priced auctions are fraudulent with target groups bidding up the price with no intention of actually buying it from their "friend". I've tracked Cox products on Ebay for the last 5 years & do not see any trend at all that puts reasonable Cox engines out of a reasonable price range. Even VGMC1 selling Cox clone plugs for $4.00 has lots left or you can go the Galbreath aftermarket head route....your choice.
Bottom line, affordable Cox engines will be around for as long as we are!
Cheers,
Paul