Here's the thing, "high security" pins do not necessarily make a lock "high security". For example, if you took a bottom-of-the-barrel Kwikset lock, dumped the pins out, and replaced them with a few spools, all you have now is a few pick-resistant pins sitting inside a bible with ridiculously loose tolerances. So sure, you have some higher-security pins, but the sloppiness with which the lock was milled means it'll probably still be trivial to determine the cylinder's bind order for all but the most novice lockpicker... and often times, once you know the bind order, you're well on your way to opening the lock.
Security is often an exercise in layering. Pick-resistant pins are just one part of that, and it would be erroneous to assume that putting "good" pins in a "bad" lock will turn the latter into the former. Often times it takes just one weak link in a secure system to undo the integrity of the rest of it, and locks are no exception.
Or, to be
really succinct: crap in, crap out.
