This is just a top-up strategy for your Dollar Cost Averaging investment strategy.. when the index fund corrects 7%.. you buy. When it goes further down to 10%.. you buy.. When it goes further down to 15%.. you buy.. and so on. You get the point.
More often than not, these corrections begets another higher move breaking the price structure.
You probably think this is crazy, but why is it crazy? Since when buying on discount is crazy?