That is a very good question.
I believe it can be a good idea, especially if one likes to set & forget.

If one is considering the idea, I believe it is a strong idea not to double up on any duel selections from the various systems being used , this stops the cannibalisation of any profits.
Just because it is selected twice , does not mean it has twice the chance of winning.

Try & work to a total bank of betting 200:1 ratio.
Any less than this , one will find it harder to deal with the ever changing frustrations of punting.
That way one is more likely to stick to ones plans of attack, it also makes it a lot easier to manage.
If a profit is made for the month, adjust bets up.
If a loss is made, adjust bets down, all at the 200:1 ratio.
This keeps it more manageable & ones brain wont get so scrambled during a bad run, knowing we can reset the balance to a 200:1 ratio, if need be.

If one would like to computerise the selection method , one could consider using the GTX program. But it does come at a price which one has to try & justify.
With this , one could have 200 systems & it will work out the whole lot in less than 5 seconds & this includes the scratchings.

The best systems I have come across, only seem to have about 1-5 bets a month, betting 7 days a week.
So if one had say 100 systems all going at once, there would be approx 250 bets a month.
Again, try not double up on duel selections.

So one can see, that one would go crazy if one had to do all this manually , only to end up with zero selections for the day for a particular system.
The day would be over before one had any time to put the bets on.

It is a strong idea to place ones bets with someone like IAS Supper Price which offers best of 2 Totes, or better still Betfair SP if it ever gets up & running in this country for all races, because the value can be terrible if one is using logic to formulate the selections, then placing the bet on your TAB account.
Your good logic is often reflected in its final price .

If the systems are based on form logic, you will notices when they win , the return is terrible, when they lose , their price can be excellent , but it did not win and that will continue until one is fed up with the constantly small percentage LOT.
So don't bet with your local TAB if one wishes to have any hope of long term profits.

I have found the best systems work on following what is happening in the market , race to race, narrowing the chances down to 2-3 chances.


Cheers.

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Cheers.