system
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human
[Star Wars] Why did Qui-Gon not just take what he wanted by force?

He was willing to try to mind control Watto to had over the Hyperdrive, I don't see how pulling a light sabre on him would be any less honourable. Watto didn't seem to have any enforcers and it's likely that the only large armed presence would be under the control of the Hutts, so they could be in and out before anyone was the wiser.


Failing that he could just wander round the other stores until he found someone he could mind trick in to exchanging his Republic credits then return to buy it.

Seems easier than a convoluted pod racing gamble.
gpt
While Watto may not have had muscle immediately there, Qui-Gonw as well aware that this was a Hutt world and he had no means of immediate escape. The Hutts do not take well to Jedi attacking and stealing from traders and would at the very least have taken a great interest in Qui-Gon and his ship. 

Qui-Gon was trying to keep a low profile, the last thing he needed was the Hutts poking around and finding Queen Amidala and deciding to take her and then random her off to the highest bidder, or worse! Remember, it took a while to install the drive on the ship and a Jedi would have got a LOT of attention very quickly. 

In regards to finding another one - the hyperdrive he needed was quit particular and he could tell that Watto was at least telling the truth when he said that no one else would have one. He was stuck trading with him.