Yes, you... and sleeping for 8 hours is somehow worth more than 1500gp how exactly?
Using
Wish to duplicate a lower level spell is really only a good idea if you a) want the lower level effect, and b) can't cast the lower level effect.
The reasons for not being able to cast the lower level effect include i) wrong class, ii) not having memorised the spell, iii) not having the spell in your spell book, iv) not having the material components, v) not being able to manage the somantic component for some reason (
Wish is Verbal only), vi) out of casting slots.
Of these reasons preventing casting, not having the material components is usually the
easiest to overcome. High level characters with access to
Wish typically have access to money and/or other resources.
So, there are certainly circumstances when using
Wish is a great idea.
Just using it to save spell component cost seems a bit unlikely, unless the PC has got plenty of time and nothing much to do (and has access to the
Wish spell, of course). However, typically adventurers having Adventures have little time and lots to do.