On covering 2nd with an exacta bet(s),
We have all heard how jfc has 100's of tickets if not 5000 on occasion but the small punter does not need to do anything like that to achieve results not so far off his for accuracy of returns.
A few key assumptions need to be made however. Gintara's strike rate suggests his selections are easily inside the top 6 in betting ( probably top 2 ) and you should all know that the top 6 in betting account for over 80% of all winners. This gives us an idea of exacta returns AND what is required to cover most exacta outcomes for 2nd. A punter can cover a total $10 bet quite well for just $2 out of that $10 by writing just 4 50c tickets in a typical market using market order and assuming your parlay selection is the favourite or 1 :-
2 and 3 winning provide 58.33% of the exacta dividend
4 provides 41.66%
5 provides 29.16%
6 provides 12.5%
So just 4 tickets gives us weighted returns to the likely price and a good chance of getting our stake back.
You can cover even smaller outlays than $10 but your % returns get harder to ensure the return of your stake.
Keep in mind that not all markets are the same and you will need to adjust this base to suit a given market. For example :-
Platinum Angel ran 2nd to Belsonic last Saturday and the exacta paid $22.20. The shape of the market clearly showed that there were 4 main chances to beat it much the same in price so the $2 could be done with just 1 ticket and you could drop the 6th in market order as well. This means you would have 50% of the exacta dividend of $22.50 returning $11.25 per total $10.00 bet. Other combos may have returned a little under $10.00 so it even out in the long run.
Sure it's more work but do you want to get 4 out of 4 in your parlays and 4 dividends or just 3 out of 4 and 1 return. Doing them as individual bets also means you can change things when a storm hits half way through the day or a horse gets scratched.