That goes against the very reason for the salary cap.
The cap was put in place to save clubs against themselves. By ensuring they didn't spend more then they could afford and get into financial difficulties.
When clubs finish down the back end of the field their membership contributions decline and their sponsor monies are adversely affected.
So allowing them to spend more when their income is less is exactly the opposite of what the cap was meant to provide against.
The salary cap was also designed to make sure rich teams do not buy all the talent etc and ensure it was a level playing field.
Most of the competitive sports have a salary cap to level the playing field. Also some have a draft or transfer system. American sports, afl and even soccer has it.
NRL thanks to previous legal actions do not have a transfer or draft.
Most NRL sides take years to get over wooden spoon. Most teams usually do not bounce back to win a competition in next 10 years.
I reckon $250k extra will be a god send to bottom two sides and don’t forget not all sides currently are on salary edge. A few purposely ensure that there is money in case they have to upgrade. They are the good clubs.