I've been betting on the NBA for years and I've seen this script repeating itself so many times.
Those who were so sure the Lakers will grab the championship in Game 5 are now turning into those who bet on Miami. Seems like it's easy to twist people's minds so easily.
Miami in Game 5 had a spread of +7 points, now it's +5 points and the psychology works great.
Here is what I think about Game 6 and about the NBA in general:
I expect the Lakers to win Game 6.
The "chance" to bet on the Lakers to win with the spread or with Money line is now, not in game 7 because there won't be any game 7.
The guy who bet his rent money on Miami - I loved that GIF someone posted to you seeing Danny DeVito saying "Ha" burning money
https://tenor.com/be6IF.gif
My suggestion to you is to "hedge" your bet and bet on the Lakers winning Game 6 (not the series as the odds are better) and thank me later.