I left a mean of 10'000 H1 pubs (EU) to determine whether the rebate would be profitable and ended up with 106 pips each H1 bar.

Let's suppose we have a awful commerce :
we must cover the spread (let's suppose 20 pips) and also the price of the cancellation (let's take 50 pips) : therefore a total of 70 pips

if the second trade is great (50/50 proba) : let's suppose we earn 106 pips (the mean), also with the preceding cancellation : we created 36 - 20 = 16 pips

maybe not a lot. Everything depends on the price of the cancellation at the end. When it's greater than (106 - two*spread) then do not buy it.
That would be me advice.

Jeff