Blackpool looked safe a few weeks ago but a run of just one win in 10 matches has seen them dragged back into the relegation picture.
Oyston defended his stance on not over-spending and pointed to Coventry, Southampton and Leicester as examples of how teams can run up debts.
"There are clubs below us that wish they'd not gone on a spending spree because that's put them where they are now," he said.
"It catches up with you eventually - there are some scary stats out there about clubs in debt. Let's not forget these are clubs that average two or three times our gates and have been in the Premier League recently in some cases.
"We're a completely different example - we want to build and not put ourselves into free-fall as other clubs have."
Oyston admitted he has considered what might happen if the club go down.
"You have to plan for every eventuality. It would be extremely unprofessional of us not to plan like that," he added.