Store Small amounts?? Or buy bitcoins in a flexible way, either it's low or high doesn't really matter so far it gives a much more flexible way to buy Bitcoin over a longer period of time, giving an additional opportunity to hold and continue buying at the same time.
Generally DCA have little or no contribution to storing but centralise more on buying strategy,you used the word "purchase" later which seem to suit and buttressed your point.
You are right if you can invest here in a small scale, then the price is not an issue, but bitcoin sometimes rises so fast, in some cases it happens so fast that many people here can not even want to invest. Here it is very important to invest consistently in terms of investment.
Many times it is seen that even if you invest much less, if you maintain the consistency, it is possible to achieve a very good profit.