Trying to safe pennies over quality will humble you few months or a year later when mining crypto, today I almost but down my house thank God I just went down to a store nearby, should have knew but I am sick with cough and catarrh so my nose is not working right.
Don't buy cheap risers
Don't buy cheap Pcie extender cables ( that's what I did ), in fact don't go cheap on your setup than buying cheap GPU, other parts are very important, that includes the power supply as well.
Good thing that the fire did not burn your whole place down- though it is very unfortunate to hear that your video card got burnt.
A few questions on my mind: is your place properly ventilated? Where is your mining rid also located? How is the climate on your country? These factors affect ultimately the outcome of your mining rig as it directly affect the proper temperature required for the rig to properly function. But you are right, there are no shortcuts to mining and purchasing cheap products to substitute for some parts would likely cause the issue of this.