Why? Because some of us will pay ungodly sums of money to have some gear. For instance, this morning a friend of mine sent me a link to an eBay item: A 1967 Marshall Supa Fuzz pedal. The seller is asking $4,999.00. That’s under $5,000! Wow! And shipping is included! What a deal!
Granted, this was Pete Townshend’s favorite pedal back in the 60’s and 70’s; I get that. And I totally get the vintage mojo with a pedal like this. But $5K? Not sure about that. And besides, if memory serves, this was a clone of the Tone Bender.
But there’s no rhyme or reason to getting gear, so I would never begrudge anyone for spending their money on something they want. For me though, paying several thousand for a pedal isn’t for me.
Guitar Gear 
Yes, I agree, this is ridiculous, however, here’s one that takes the cake! Right now, on eBay, there are folks selling a set of 4 “vintage” Les Paul knobs that are (supposedly) off of a ’59 model for $499!! LOL
I saw that one… just amazing…
Also, you’ve got kits out there that have NOS mustard caps like this one: http://www.ebay.com/itm/JMI-SUPA-FUZZ-PEDAL-LIMITED-EDITION-HANDWIRED-1-100-NEW-BOX-/160908915169?pt=Guitar_Accessories&hash=item2576eb31e1 for a tenth of the price. 🙂