At the very bottom end of gear, there is poor gear. For example, some very cheap fins are plastic, flimsy, don't push well and don't last very long. With things like regulators, this is going to be much less likely, because no company can afford the liability of regulators that fail and cause accidents. Within a very broad middle range of prices, equipment will be functional, and the highest priced items are often placed there because they are the "new, improved" version, with lots of bells and whistles that, in the end, do not turn out to be anywhere near as great as the manufacturer touts them to be.
For new divers, buying high end everything is really absurd (and I wish dive shops didn't push people into $200 fins all the time) because we know that, sadly, many people who get certified will never dive at all, or very much. Buying a set of relatively inexpensive equipment and USING it is a good way to stay in the sport. If you find that you're addicted, you can trade up, and although selling used gear does not recoup much of the cost of it, it does help some.
When fins can run from $30 to $700, I don't blame ANYBODY for asking if there is a less expensive way to get the job done.