Doing a poor job can bite you in the ass because if it fails again, many companies will send the same tech tech as before (because they’re assumed to already have some familiarity with those specific machines). So it might just end up putting you back in the same place again.

I used to be in the trades and occasionally had to deal with misogynist shitlords. When that happened, I’d still have to go do it, but I assigned a silent PST - the Pain and Suffering Tax - that rose with every comment they made, every second they spent watching like a hawk at my elbow because they didn’t trust the ability of someone in an AFAB body, etc. They ended up paying a lot more than the average person for the same repair, and they never knew. But the higher price probably also meant that they’d be more likely to call another company the next time, and then they’re not my problem anymore.