I just checked for multiples in the 3rd, 4th or 5th fav selected races. Out of 6 races selected to date that had multiples, here are the results:

No races had the 3rd and any previous on same odds.

3rd and 4th fav on same odds, 0 wins and 2 losses for a loss of 22.00 units

4th and 5th fav on same odds, 2 wins and 2 losses for a profit of 90.00 units

I think the multiples pay for themselves well but is waaaaay too early to tell. I wish I could work out how to use a database and backtrack it all.

However. I also looked at when the 5th fav was at the same odds as the 6th or 7th or thereafter. 6 races return a win of 46 units from an outlay of around 70 units, so there could be something in dropping races where my last horse selection is on the same odds line as the 6th fav. I will keep track of that one.