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Dollar Cost Averaging (Or value averaging) vs Lot sizes, what am I missing?
This is more than likely a thing about your financial institution and the exchanges where they trade shares. Some exchanges cannot/will not handle odd lot transactions. Most established brokerages have software and accounting systems that will deal in round lots with the exchanges, but can track your shares individually. Sometimes specific stocks cannot be purchased in odd lots due to circumstances specific to that stock (trading only on a specific exchange, for example).  Most brokerages offer dollar-cost averaging programs, but may limit which stocks are eligible, due to odd lot and partial share purchases. Check with your brokerage to see if they can support odd lot and/or DCA purchases. You may find another similar ETF with similar holdings that has better trading conditions, or might consider an open-end mutual fund with similar objectives. Mutual funds allow partial share purchases (you have $100 to invest today, and they issue you 35.2 shares, for example).