Sure you can get a 1990's LP for $1,300 or less on eBay, but try finding a 2012 LP Standard for much less than $1,900!
Okay, I will try...
Well, that took about two seconds...
Sold recently on ebay starting at $1300:
Ooooh, lots of them even include fancy cases!
Shall I go on...?
I also see them all the time on local Craigslist for $1200 to $1500, you just gotta look.
AND SINCE THE JIST OF YOUR ORIGINAL STATEMENT WAS "A GIBSON TECH GUITAR WILL NOT LOSE VALUE AS MUCH OR AS FAST AS A LINE 6 TECH GUITAR WILL" (paraphrasing): I have provided links that show the opposite, please link to examples of Firebird X guitars that sold for anywhere near what they cost originally.
There are no available sales figures for JTVs from the 90's, but... is a Les Paul from the 90's a different guitar than a Les Paul from last year? Does a Les Paul really lose more value as the years go by? Is a used 1980s Les Paul worth less than a used 1990s Les Paul? And a used 1990s Les Paul less than a 2000s Les Paul? And a used 2000s Les Paul worth less than a 2010s Les Paul? I don't think so... OTHER THAN VINTAGE GUITARS a used Les Paul's value is determined by model, specific details (top/finish etc.) and condition. A used 2012 Les Paul is worth no more or less on the resale market than a used 1990 Les Paul of the same specs.
And a Les Paul is NOT a LPX/Firebird X/JTV.
SURELY you can see the difference. No? Okay... see, a Les Paul is a timeless classic musical instrument that has been desirable for more than 50 years and proven to be of value by countless musicians on countless recordings and live performances, and a LPX/Firebird X/JTV is a cutting edge tech gadget aimed at a small market of open minded adventurous guitarists that will be obsolete in a few years when the next generation of tech gadgetry comes along.