Hyperbolic discounting is the term economists use to describe people liking things a lot more now than later:

https://en.wikipedia.org/wiki/Hyperbolic_discounting

The hedonic treadmill is, in a nutshell, the reason we become complacent to newly acquired luxuries:

https://en.wikipedia.org/wiki/Hedonic_treadmill

So not only do we want fancier things now, but we don't really appreciate them when we have them! Humans are silly.