high-end's a very subjective term. to me, high-end just means more than what you need. a high end guitar's fitted and adorn with all the lavish woods, AAAA maple, nice inlays, gold hardware, rare woods, brand name, which equates to cost making them expensive. low-end might just mean a stripped down guitar, say in a Les Paul case, epiphone wld be comparatively low-end (epiphone lovers pls don't flame me) while the gibson would mean high-end. it doesn't mean that the epi LP will under-perform the gibson LP ceteris paribus (in economics, ceteris paribus = all other factors remain constant except cost in this case), including workmanship. so yah, if you're a good player, a stripped down guitar wld still work for u.
ermmm.. pls take my post with a pincha salt, i may not be in the right mind while posting this.