There is no such thing as a minority government, you cannot govern if you aren't able to govern..
What is the point in proposing legislation only for Labour to vote it down, what is the point in Labour proposing legislation only for the Tories to vote it down. The end result is always zero and what is the point in not having a functional government able to do anything at perhaps the most pivotal point in our recent history.
The DUP were democratically elected and their offering will be on confidence meaning they won't have any ability to chuck in stuff into the agenda.
There have been minority governments in the past, most recently in 1974. They don't usually last long but is it likely that a Tory/DUP alliance will last the course? Even if they don't fall out there's the risk of losing seats at by elections, losing key votes due to rebellions (especially over Brexit), sick MPs not being able to vote etc. A minority Tory government might be able to limp along for nearly as long if Sinn Feinn don't take their seats and they call the DUP's bluff. Will the DUP really vote to bring down the government and put Corbyn in power?
If the Tories do have to fight an election in the next couple of years, I think they have a better chance if they don't stand accused of bribing the DUP.