"Thousand Dollars Worth" or "Thousand Dollars' Worth". Is this a Possessive?

I was writing the following sentence:

Five thousand dollars worth of equipment does not a professional photographer make.

Apart from the other questionable syntax in this over-stylized sentence, what occurred to me, courtesy of Microsoft auto correct, was that "thousand dollars" may need to be in possessive form, though it's not immediately occurring to me why this would be. So which is correct:

Five thousand dollars worth of equipment does not a professional photographer make.

or

Five thousand dollars' worth of equipment does not a professional photographer make.

These cases aren't tricky if you ask yourself the following question: how would you write "one dollar's worth"?

In other words, "dollar" naturally requires an "s" in this case, even though we are talking about "one dollar".

Therefore, it is a case of possession, meaning that we are referring to the "worth" of "thousands of dollars". So, the possessive apostrophe should fall after the "s".

The same rule applies to "seven years' jail" and "one year's jail". Many journalists etc. are clearly none the wiser about this topic, as even some of the most astute publications contain articles which omit the apostrophe.

The possessive is necessary because you're indicating that the worth or value possessed by the equipment is equivalent to the worth or value possessed by five thousand dollars. Hence, Five thousand dollars' worth