FYI, You may want to reconsider that. Or maybe you are right...
I'm not going to attempt to explain why, because I can't, but I will quote a guy who seems like an authority, as he wrote this "War and Peace" on ETF costs http://www.etfconsultants.com/Reducing_ ... _Costs.pdf
"Using MOC Orders Routinely to Buy or Sell ETFs Looks Like a Terrible Idea
The majority of investor ETF market-on-close orders are not likely to be executed at or
“better” than NAV, and many MOC executions will not even be close to NAV. MOC orders can
be executed at a much greater distance from the NAV than the reported premium and discount
data indicate to investors. Anyone trading ETFs should understand how these orders work and
how ETF MOC orders differ from stock MOC orders. If you compare a fund’s NAV and closing
price for a few days, you will probably conclude that you do not want to use an MOC order –
unless your comparisons suggest that, for some reason, other investors are predominantly selling
when you buy or buying when you sell. At the least, you will conclude that the cost to trade
most index ETFs is more than a few basis points."