well wonder no more :

Good Tracks: Loss of 2.2% and 14.98% Strike Rate (16515 selections)
Wet Tracks : Profit of 5.8% and 14.81% Strike Rate (7379 selections)

Used Aus tracks only as Wet is very different in different countries.

So there you go top weights in the wet actually produce a profit because like you most people percieve the wet track hurts them but in reality its only a 0.2% difference of 1 - 2 horses per 1000 top weights which lose compared to the dry tracks.

But hey keep it a secret ... don't want others knowing these important stats.

Betfair SP prices used for analysis.

Temps Voleur looks like a qualifier
R3 Morphettville today

Jetoomy looks like a qualifier
R8 Belmont today
Same meeting,,Atlanta Blue,,equal topweight

Royal Symphony looks like a qualifier
R2 Flemington today

I Am a Star looks like a qualifier
R6 Flemington today

Almandin looks like a qualifier
R8 Flemington today

Winner,,Jetoomy (Perth) also won
And some others,,but weren't handicaps

Winner,,Cashed (Adelaide)

Bay Road,,winner Morphettville Sat,,looks like he qualified

Showing a profit with a similar system but I don't bet those drawn middle to outside barriers on tracks better than dead