Let's see...I paid $500 for my HD500 and this one will set me back $500 more, making $1000 invested. IF I could get $250 for my now used and inferior HD500, that knocks my investment back to $750 for a Pod HD500x that other's are getting for $500 new. That's a roughly 20% processing power increase for $250 whereas a new buyer get's it for free by buying the more powerful one up front.
Well, first of all if you're looking as guitar modelers as an investment instrument, you probably should start diversifying your portfolio. They all lose their value as time goes by. They're essentially computers in custom-built shells. People should really think of these modelers as something more like a laptop or other piece of tech. They start losing resale value the moment you buy it, but the resale value isn't generally thought of when buying new tech devices. We buy tech devices because of their usefulness over their life cycle.
The way I look at is this. I bought my HD500 for $425 (I had a 15% coupon at one of the online retailers) at the end of 2010, so I've had it for almost three years now. Even if I sold it as a crazy low price like $200 now, I be out a net of $225. So let's say I've had my HD500 for 144 weeks. That means my cost of owning the HD500 over that time period is $1.56 a week... I don't know about you, but I spend more than coffee per day. It's an OK deal if you ask me. Even if the resale value went to zero, and some paid the full street value for the HD500, the cost of ownership would $3.47 per week. Again, it's really not bad considering all the HD500 offers.