There is no harm in starting small, investors who have little sizable amount that can accumulate fractions should make use of the opportunity. I would also advise small sized investors to conserve some capital in order to get more fractions at a lower price during the dips, that wouldn't stop them from the little they can DCA, the most important is doing the whole process of investment right without exceeding their financial ability.
If you lay a brick everyday, one day you'll end up having a brick wall. DCA is a solid method to build a portfolio, and it holds tight on discipline. However, going against our basic needs just to accumulate some assets is very wrong. I was watching a series of a man who refused to pay his kids school fees and health care, because he was saving money to earn a title in his village. Habits like that are not acceptable, if a strong need arises that requires spending what we have saved, it's of great importance to settle the problem and still go ahead to pile up the wealth.