i think this miner will be worth very little after warranty expires. it makes good deal to gamble and get 20% more coins. crypto value is very risky by ifself so overclocking miner imo is no bigger risk. i doubt all asics will die at once anyway.
Per Bitmain support : Over clocking of antminer will void your warranty. Should at least wait until your warranty expires after 180 days otherwise its a big gamble.