Very true - and as well as freeing you from bad jobs, UBI frees you from bad marriages. According to a recent Freakonomics podcast, a trial of UBI in a Canadian town lead to a rise in divorces. It was therefore shut down with extreme prejudice by socially conservative politicians.
On the bad job front, I think a UBI could resolve an imbalance that has always perturbed me. When I was travelling, I once got a job in a laundry - I hadn't realised that laundries have dirty and clean ends, and guess where new employees start! It was disgusting, and the only positive was the space everyone gave me on the crowded bus home. Then a contract job came through compiling a report that an overseas company had promised to carry out if they got some contract. I went from a horrible job on minimum wage to a plush office job at ten times the rate, and at the time it seemed crazy that I was paid more, not less.
A UBI would seriously shake this up. Society would have to pay more to incentivise people to do the the less-glamorous jobs, which to my mind would be fairer.