Hey, I really want to be on your side in this argument, but that number of positions is certainly greater than 535, right? More of those than there are elected federal positions.
The 535 number only counts one 'round' of Congress-critters. Let's assume the max term is 2 years, and all Congress-critters are in lock-step on their terms. So 535 leave Capital Hill, and enter industry and a new wave of 535 enter Congress. In 2 years, when it's time for them to leave (and enter industry), industry now has a workforce of 1070 ex-Congress-people (assuming that all of them enter industry). That number will continue to grow unless the industry positions after leaving office are capped (and the greater the cap, the greater the market saturation on these industry positions are). If that's the case, then those industry positions are consequentially less valuable.