2- Or take the more conservative route and target just 10% profit per day, slow grind but safer?
There is no fun in a hurry of sports betting, that's why if it's me. I'll take this route. The slower one and the fun is in there.
I do sports betting primarily for fun and not neccessarily for the money. This does not mean that I don't aim to win as well. So base on this, anyone goes for me. A win is a win regardless of what amount is involved. Even without money involved, there is still this satisfaction you get knowing that you made a prediction and it happened exactly the way you predicted it.
The worst thing in gambling you can do is to plan profit. It means that you will do your best to reach planned numbers. But the same time it means that you will increase risks, bets, etc. You will break your own rules.
Expectations hurt so much when they are not met. Having some high expectations can make one not appreciate small wins while still getting emotional unnecessarily. When a gambler plans ahead what profit he wants, it raises his expectations. If he doesn't get that or even got something below his expectations, it would hurt him.