A few things are going on around this time and all of it factors in at least a little:
It's during the era where NBC was trying their DAMNDEST to grow its' daytime audience and was willing to occasionally throw money at their shows to fix it (when that failed, NBC shows became noticeably cheaper save the fixed-cost Super Password, and eventually, NBC would rapidly retreat from game shows pretty much the second Tartikoff left in 1991, only really trying one more time after that in '93)
Press Your Luck, singly and specifically, had forced CBS to finally abandon their winnings limit, opening the door for the rest of CBS Daytime to give away more money more often.
The show was 14, 15 years in - passing Squares in '86 and passing Concentration in Spring '87 to become the longest-lasting daytime game EVER. Price's numbers were still strong but in a business where especially then old = bad, Price no doubt faced pressure to prove it still had a place and wasn't just some cheap 70s holdover giving away $6000 and a case of turtle wax
The show had gotten used to giving away bigger ticket items in the two nighttime versions pre-dating this point in the run (the Kennedy run often giving away very expensive prizes, especially in the showcase, during the first two thirds of its run, and the short lived CBS Primetime version having a large budget as well), so the staff had gotten used to the more expensive prizes. And since they still had the daytime numbers to justify it, it made the conversation about a bigger budget easier - and when CBS replaced Press Your Luck with nothing in Fall '86, that left several tens of thousands per week in the daytime budget that wasn't being spent on anything (remember that the budget doesn't just includes prizes but the staff as well)...so I wouldn't doubt in the slightest if Price wound up with a boost around this time.