Thats pretty funny.

Heres the best way to pick the right time every time...

Its Betfair.
But I think you already know that.

Why anyone has anything to do with the TAB is beyond me & one is paying 18.5% impost for it.
Especially if using real money.

One would not do business with say a Supermarket that changed its prices at the check out, so why do it with the serious business of punting.

Their place divs are way better than any TAB & your price gets locked in.
Example
Launceston 4/2
Betfair paid 15.60/ 4.30 before com
TAB...........14.50/3.30

There is a place difference of 43% (Using fractional odds )

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Cheers.